Chemical and physical properties

Name:17-Methyltestosterone
Molecular Formula:C20H30O2
Molecular Weight: 302.46
Synonyms:Androst-4-en-3-one,17b-hydroxy-17-methyl- (8CI);
Appearance:White to Off-White Crystalline Powder
Density: 112
Boiling Point: 104-116 C (1 torr)
Melting Point:162-168 C
Flash Point:185.3 C
CAS Number:58-18-4
Solubility: Practically Insoluble
Stability:Stable under normal temperatures and pressures

In fish culture, 17-methyltestosterone is often used to produce monosex populations of those species which tend to overpopulate.

Details about suppliers of 17-methyltestosterone in Guidechem

1 Wuhan Fortuna Chemical Co., Ltd.
Updatetime:Feb 15 2014
Purity:99% Min. Order:1/Kilogram Supply Ability:100 Month/Kilogram
DetailDesc: 17-methyltestosterone 58-18-4 C20H30O2 1.High quality : the purity is 99% min . through multiple producing procedures. 2.Competitive price : low price because of our skilled production technolpgy ,save the production cost at most , and give big profit room to our customers.
Tel:0086-27-59207850
Address:A2705,Dong Yi Shi Qu,129# XinHua Road

2 Hangzhou Dayangchem Co., Ltd.
Updatetime:Feb 17 2014
DetailDesc:17-alpha-Methyltestosterone
Tel:86-571-88938639
Address:B/2601 Fuli Building, 328# WenEr Rd. Hangzhou City 310012 China

3 Shanghai Dell Chemical Co.Ltd
Updatetime:Feb 16 2014
FOB Price:0 USD/Gram Purity:99% Min. Order:10/Gram Supply Ability:100 Month/Kilogram
DetailDesc:Shanghai Dell Chemical Co.Ltd. is specialized in trading and developing active pharmaceutical ingredients, intermediates, API, and custom synthesis according to client’s requirements.
Tel:86-21-51950635
Address:Nianjiabang Rd, Pudong, Shanghai

4 Jinan Haohua Industry Co., Ltd.
Updatetime:Feb 17 2014
Purity:99 Min. Order:1/Kilogram Supply Ability:100 Year/Metric Ton
Tel:0086-531-58773055
Address:No.59 Gongye South RD

5 Boc Sciences
17-methyltestosterone
Updatetime:Feb 14 2014
DetailDesc:17-methyltestosterone
Tel:1-631-5046093
Address:45-16 Ramsey Road Shirley, NY 11967, USA

6 Zhejiang Kaili Industrial Co., Ltd.
17-methyltestosterone
Updatetime:Jan 08 2014
DetailDesc:Zhejiang Kaili Industrial Co., Ltd. is collect Science, Industrial and Trade together for a comprehensive high-tech entities. We are mainly engaged in the research, development, production and sales of APIs and pharmaceutical intermediates.
Tel:86-571-85241926
Address:Block C&D,12/F,Lantian Business Center,No.18 Moganshan Road,Hangzhou,China

7 Shenzhen ShiJinGu Pharmaceutical Co., Ltd
Updatetime:Jan 25 2014
Purity:99% min. Min. Order:10/Gram Supply Ability:800 Month/Kilogram
DetailDesc: 17-Methyltestosterone Synonyms: Metandren CAS: 58-18-4 EINECS: 200-366-3 Assay: 99% min. Packing: foil bag or tin. Delivery: Express courier. Character: White crystalline powder, odorless, tasteless, hygroscopic, light case of deterioration. ethanol solution at 240nm wavelength.
Tel:86-755-61930361
Address:Longgang District，Shenzhen City,GuangDong Province,CN

8 Hubei Nosk Chemical Co.,Ltd
17-methyltestosterone(CAS NO:58-18-4) 
Updatetime:Jan 30 2013
DetailDesc: Molecular Formula: C20H30O2 Molecular Weight: 302.45 Synonyms: 17beta-hydroxy-17alpha-methylandrost-4-en-3-one
Tel:86-27-87677569
Address:No. 46, Shucheng Road, Hongshan District, Wuhan, China

9 Wuhan Jadechem Chemicals Co., Ltd.
17-Methyltestosterone
Updatetime:Feb 15 2014
Purity:98% Min. Order:50/Gram Supply Ability:300 Month/Kilogram
DetailDesc: 17-Methyltestosterone Synonyms: Metandren CAS: 58-18-4 EINECS: 200-366-3 Assay: 99% min. Packing: foil bag or tin. Delivery: Express courier. Character: White crystalline powder, odorless, tasteless, hygroscopic, light case of deterioration. ethanol solution at 240nm wavelength.
Tel:86-27-63548920
Address:Street #152 Jiedao district Dongfang building A2 1

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 N-Boc-S-Trityl-L-cysteine is also known as Boc-S-trityl-L-cysteine, a kind of white powders with Molecular Formula: C27H29NO4S and Molecular Weight: 463.59. The other properties are : Density:1.2 g/cm3, Boiling Point:610.9 C at 760 mmHg, Melting Point:143-146 C, Flash Point: 323.3 C, Storage Temperature:2-8 C, CAS Registry Number:21947-98-8.

Here are some supply information about N-Boc-S-Trityl-L-cysteine in Guidechem. I will show you and I hope it will helpful for your business. Guidechem chemical B2B network provides information on china and global chemical market quotation and relative chemical Information.

Capot Chemical Co., Ltd.
N-Boc-S-Trityl-L-cysteine
Updatetime:Feb 13 2014
Purity:98% Min. Order:1/Kilogram Supply Ability:up to kgs Month/Kilogram
DetailDesc:463.59,C27H29NO4S
Tel:86-571-85586718
Address:Joinhands Science Park, No.4028,Nanhuan Road

AOPHARM
Updatetime:Feb 13 2014
Purity:99%
DetailDesc:White Powder CAS Registry Number:21947-98-8
Tel:86-311-66600578
Address:C-2103 Wonder Business Square, 15 Yuhua West Rd

Hangzhou Dayangchem Co., Ltd.
N-Boc-S-Trityl-L-cysteine
Updatetime:Feb 13 2014
DetailDesc:Boc-Cys(Trt)-OH
Tel:86-571-88938639
Address:B/2601 Fuli Building, 328# WenEr Rd. Hangzhou City 310012 China

Atomax Chemicals Co.,Ltd
Updatetime:Dec 11 2013
Purity:95%+ Min. Order:mg/g/Gram Supply Ability:kg/T Month/Gram
DetailDesc:We are a leading global supplier and manufacturer of chiral chemicals, amino acids, aromatic and pyridine halogens, natural extracts and pharmaceutical raw materials. Those chemicals are widely used in the pharmaceutical and fine chemical industries and in research laboratories.
Tel:86-755-33239182
Address:Huiji302 Hutingju Sanwei Xixiang SHENZHEN 518126, China

Jinan Haohua Industry Co., Ltd.
Updatetime:Feb 13 2014
Purity:99 Min. Order:1/Kilogram Supply Ability:100 Year/Metric Ton
Tel:0086-531-58773055
Address:No.59 Gongye South RD

Hui Chem Company Limited
N-Boc-S-Trityl-L-cysteine
Updatetime:Feb 12 2014
Purity:98% Min. Order:1/Gram Supply Ability:10 Month/Kilogram
DetailDesc:We could receive custom synthesis according to your requirements from lab scale to commercial scale
Tel:86-21-60542966
Address:Lane 299 Bisheng Rd,Pudong District

Boc Sciences
N-Boc-S-Trityl-L-cysteine
Updatetime:Feb 11 2014
DetailDesc:N-BoC-S-Trityl-L-cysteine
Tel:1-631-5046093
Address:45-16 Ramsey Road Shirley, NY 11967, USA

Rosewell Industry Co., Ltd
N-Boc-S-Trityl-L-cysteine
Updatetime:Jan 09 2014
DetailDesc:We are the leading supplier of APIs,inhibitors, animo-acids,peptide, other pharmaceutical intermediates, and custom synthesis products.
Tel:86-519-86202821
Address:Qixing building, Mingxin road, Changzhou,Jiangsu,China

Angene International Limited
Updatetime:Jan 08 2014
DetailDesc:You can find N-Boc-S-Trityl-L-cysteine with most competitive price and high quality here. Welcome to inquire for stock confirming.
Tel:852-852-81916999
Address:4/F Silvercord Center Tower 1, 30 Canton Rd,KL,Hong Kong

Shanghai Pengteng Fine Chemical Co., Ltd.
N-Boc-S-Trityl-L-cysteine
Updatetime:Oct 17 2013
DetailDesc:Our company keeps the business tenet of “people first and customer esteemed” and the service principle of “superior quality, reasonable price, good faith”. We insist on the principle of win-win cooperation and would like to create brilliant future hand in hand with you!
Tel:86-15262230-560
Address:No.9, Haikou Road, Huai'an Industiral Park, Jiangsu Province, China

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2-Amino-4-nitrophenol which is also known as 4-Nitro-2-Aminophenol and 4-NAP, it is a kind of orange prisms or yellow powders with Molecular Formula:C6H6N2O3 and Molecular Weight: 154.12. It is slightly soluble in water, stable under normal temperatures and pressures. The CAS Registry Number of 2-Amino-4-nitrophenol is 99-57-0 .

2-Amino-4-nitrophenol is produced by the reaction of 2,4-dinitrophenol with sodium sulfide. It was first sythesized by Agfa in 1898. At present, approximately 150 kg of 2-amino-4-nitrophenol are used in hair colouring products in the USA annually, according to industry estimates.

2-Amino-4-nitrophenol(CAS NO:99-57-0) is used as an intermediate in the manufacture of CI MordantBrown 33 and CI Mordant Brown 1, which are used for dyeing leather, nylon, silk, wool andfur. It is also used in some countries as a dye in semi-permanent hair colour products to produce gold-blond shades.

These products are generally shampooed into the hair, lathered and then allowed to remain in contact with the hair and scalp for 30-45 min. For this application, 2-amino-4-nitrophenol is mixed at levels up to 0.5 % with a blend of several other dyes in a shampoo base to produce the final colour or tint. It has also been used in permanent hair colouring products.

4-Amino-2-nitrophenol has been used as an oxidation base in formulations of hair dyes. Technical grade 4-amino-2-nitrophenol induced tumors of the urinary bladder in male rats, and there is some evidence for a similar effect among female rats. Tumors of the urinary bladder are extremely rare among untreated rats.

Preparations of 4- amino-2-nitrophenol have also demonstrated genotoxic potential in a number of short-term tests in bacterial and mammalian cells, in vitro and in vivo. There is some evidence that a purified preparation of 4-amino-2-nitrophenol loses its genotoxic potential, although this has only been investigated in a single study. In support of the concern for the carcinogenicity of 4-amino-2-nitrophenol itself, the purity of the test substance administered in the studies showing the development of bladder tumors was of relatively high purity.

Furthermore, aromatic amines with structural homology to 4-amino-2-nitrophenol have shown evidence of carcinogenicity, some with the urinary bladder as the site of tumor development.

There is evidence for the carcinogenicity of 4-amino-2-nitrophenol, with development of transitional cell carcinomas of the urinary bladder, a rare tumor, observed in male mice. The weight of evidence is supported by observations of a small number of the same rare tumor type in female mice, by mutagenicity in several short-term tests, and by chemical structural analogies with known carcinogens, including several bladder carcinogens.

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Boc-L-Glutamic acid is a kind of white powder with lumps, it is also known as N-tert-Butoxycarbonyl-L-glutamic acid. The Molecular Formula is C10H17NO6, Molecular Weight is 247.25, and CAS Registry Number is 2419-94-5.

When you hand Boc-L-Glutamic acid :Wash thoroughly after handling. Remove contaminated clothing and wash before reuse. Use with adequate ventilation. Minimize dust generation and accumulation. Avoid contact with eyes, skin, and clothing. Keep container tightly closed. Avoid ingestion and inhalation. When you Store it : Store it in a tightly closed container. Store in a cool, dry, well-ventilated area away from incompatible substances. Keep refrigerated.

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Here are some supply information of Boc-L-Glutamic acid in this site.

Shijiazhuang Sdyano Fine Chemical Co., Ltd
BOC-L-Glutamic acid
Updatetime:Feb 12 2014
DetailDesc:Shijiazhuang Sdyano Fine Chemical Co., Ltd. is a company specializing in pharmaceutical intermediates, liquid crystal intermediates, PDLC LCD, OLED LCD, such as fine chemicals R & D, production and sales of integrated chemical enterprise modernization.
Tel:86-311-89830448
Address:Room 37-2-2501, Yiyuan Dong Gang Jianshe Nan Stree

Hangzhou Dayangchem Co., Ltd.
Updatetime:Feb 12 2014
DetailDesc:N-tert-Butoxycarbonyl-L-glutamic acid
Tel:86-571-88938639
Address:B/2601 Fuli Building, 328# WenEr Rd. Hangzhou City 310012 China

AOPHARM
Updatetime:Feb 12 2014
Min. Order:
DetailDesc:Boc-L-Glutamic acid
Tel:86-311-66600578
Address:C-2103 Wonder Business Square, 15 Yuhua West Rd.

Capot Chemical Co., Ltd.
Boc-L-Glutamic acid(CAS NO:2419-94-5)
Updatetime:Jan 27 2014
Purity:98% Min. Order:1/Kilogram Supply Ability:up to kgs Month/Kilogram
DetailDesc:247.25,C10H17NO6
Tel:86-571-85586718
Address:Joinhands Science Park, No.4028,Nanhuan Road,

Atomax Chemicals Co.,Ltd
Boc-L-glutamicacid
Updatetime:Dec 11 2013
Purity:95%+ Min. Order:mg/g/Gram Supply Ability:kg/T Month/Gram
DetailDesc:We are a leading global supplier and manufacturer of chiral chemicals, amino acids, aromatic and pyridine halogens, natural extracts and pharmaceutical raw materials. Those chemicals are widely used in the pharmaceutical and fine chemical industries and in research laboratories.
Tel:86-755-33239182
Address:Huiji302 Hutingju Sanwei Xixiang SHENZHEN 518126, China

Jinan Haohua Industry Co., Ltd.
Boc-L-Glutamic acid
Updatetime:Feb 12 2014
Purity:99 Min. Order:1/Kilogram Supply Ability:100 Year/Metric Ton
DetailDesc:N-(tert-Butoxycarbonyl)-L-glutamic acid; Boc-Glu-OH
Tel:0086-531-58773055
Address:No.59 Gongye South RD

China Huanyu Chemical Industrial Co.,Ltd
Boc-L-Glutamic acid
Updatetime:Feb 11 2014
DetailDesc:Boc-L-Glutamic acid
Tel:86-310-6034055
Address:Maoyi Road,Hanshan District,Handan

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Florfenicol is a kind of white crystalline powders, it has been marketed by Schering-Plough Animal Health under the trade name Nuflor, a fluorinated synthetic analog of thiamphenicol with Molecular Formula:C12H14Cl2FNO4S and Molecular Weight:358.21. Florfenicol is stable at normal temperatures and pressures, insoluble in water.

Since its launch in 1996, Florfenicol(CAS NO:73231-34-2) has gained several additional approvals. It is now prescribed for not only bovine respiratory disease (BRD) but also foot rot. For BRD it can be used as a hospital treatment or for high-risk cattle on arrival at the feedyard. If you'd like to learn more about Florfenicol, we have a full menu of topics for you to choose from.

In the United States, florfenicol is currently indicated for the treatment of bovine respiratory disease (BRD) associated with Mannheimia (Pasteurella) haemolytica, Pasteurella multocida, and Haemophilus somnus, for treatment of bovine interdigital phlegmon (foot rot, acute interdigital necrobacillosis, infectious pododermatitis) associated with Fusobacterium necrophorum and Bacteroides melaninogenicus.

The use of florfenicol(CAS NO:73231-34-2) in horses, and likely in other equids, typically causes diarrhea. This has been anecdotally reported to progress to lethal cases of acute colitis. Therefore, use of this antimicrobial in the equine patient should be limited to cases in which other, safer, options are not available.

Florfenicol, a veterinary fluorinated analog of thiamphenicol, is approved for treatment of bovine respiratory pathogens in the United States. However, florfenicol resistance has recently emerged among veterinary Escherichia coli isolates incriminated in bovine diarrhea.

Florfenicol is a fluorinated structural analog of thiamphenicol and chloramphenicol approved by the Food and Drug Administration (FDA) in 1996 for treatment of bovine respiratory pathogens such as Pasteurella spp. However, it is not currently approved for treatment of E. coli-related cattle enteric diseases in the United States. Additionally, there are no approved NCCLS breakpoints for E. coli currently available; however, the resistance breakpoint for bovine respiratory pathogens.

Florfenicol is not approved for human use; however, it is related to chloramphenicol and can select for cross-resistance among bacterial pathogens. Florfenicol has been shown to have a spectrum of activity similar to that of chloramphenicol, except that it is active at lower concentrations than chloramphenicol against a variety of clinical bacterial isolates, including chloramphenicol-resistant bacteria. Florfenicol's mechanism of action is directed at disrupting bacterial protein synthesis by binding to the 50S subunit of the bacterial ribosome and is generally considered to be bacteriostatic.

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Ethylene is a colorless flammable gas with a faint "sweet and musky" odor when pure. It is the simplest alkene , and the simplest unsaturated hydrocarbon after acetylene. It is stable. Highly flammable - note wide explosion limits. Incompatible with strong oxidizing agents. Readily forms explosive mixtures with air. It has the Molecular Formula: C2H4 and Molecular Weight: 28.05, the CAS Registry Number is 74-85-1.

Ethylene, unlike the rest of the plant hormone compounds is a gaseous hormone. Like abscisic acid, it is the only member of its class. Of all the known plant growth substance, ethylene has the simplest structure. It is produced in all higher plants and is usually associated with fruit ripening and the tripple response.

Ethylene is widely used in chemical industry, and its worldwide production (over 109 million tonnes in 2006) exceeds that of any other organic compound. Ethylene is also an important natural plant hormone, used in agriculture to force the ripening of fruits.

Ethylene oxide is used mainly as a chemical intermediate in the manufacture of textiles, detergents, polyurethane foam, antifreeze, solvents, medicinals, adhesives, and other products. Relatively small amounts of ethylene oxide are used as a fumigant, a sterilant for food (spices) and cosmetics, and in hospital sterilization of surgical equipment and plastic devices that cannot be sterilized by steam.

Ethylene is produced in all higher plants and is produced from methionine in essentially all tissues. Production of ethylene varies with the type of tissue, the plant species, and also the stage of development. The mechanism by which ethylene is produced from methionine is a 3 step process .

ATP is an essential component in the synthesis of ethylene from methionine. ATP and water are added to methionine resulting in loss of the three phosphates and S-adenosyl methionine. 1-amino-cyclopropane-1-carboxylic acid synthase (ACC-synthase) facilitates the production of ACC from SAM.

Oxygen is then needed in order ro oxidize ACC and produce ethylene. This reaction is catalyzed by an oxidative enzyme called ethylene forming enzyme.

The control of Ethylene production has received considerable study. Study of Ethylene has focused around the synthesis promoting effects of auxin, wounding, and drought as well as aspects of fruit-ripening. ACC synthase is the rate limiting step for ethylene production and it is this enzyme that is manipulated in biotechnology to delay fruit ripening in the "flavor saver" tomatoes .

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Vitamin E refers to a group of eight fat-soluble compounds that include both tocopherols and tocotrienols. It is a kind of Clear yellow oil with Molecular Formula:C29H50O2 and Molecular Weight: 430.7061. It is stable, combustible, incompatible with strong oxidizing agents and it may be sensitive to light and air. The CAS Registry Number is 59-02-9.

Vitamin E is found naturally in some foods, added to others, and available as a dietary supplement. “Vitamin E” is the collective name for a group of fat-soluble compounds with distinctive antioxidant activities. Of the many different forms of vitamin E(CAS NO: 59-02-9), γ-tocopherol is the most common in the North American diet.γ-Tocopherol can be found in corn oil, soybean oil, margarine, and dressings.α-tocopherol, the most biologically active form of vitamin E, is the second-most common form of vitamin E in the diet.

Vitamin E is a potent antioxidant. Because it is fat soluble, we see it offer protection against damage to the fats that line the outside of every cell of our body. When the fats in our membranes become damaged, important cell functions become compromised. Based on this important mechanism, researchers have studied whether diets low in vitamin E are associated with many diseases associated with aging.

We also see vitamin E protect fats from free radical damage before we eat them. We'll talk about the role of vitamin E in protecting foods during storage below in the Impact of Cooking, Storage, and Processing section.

Vitamin E helps protect LDL cholesterol (sometimes referred to as "bad" cholesterol) from free radical damage. This damaged cholesterol, often referred to as oxidized LDL, tends to accumulate in blood vessel walls in the early stages of hardening of the arteries.

Diets rich in vitamin E from vegetables, fish, and plant oils—like the Mediterranean diet for example—have been linked to cardiovascular prevention in large health surveys Understand, though, that the potential benefits of this diet are not limited to or fully explained by vitamin E, and that supplements of vitamin E have not demonstrated the same sort of preventive benefit that researchers hoped to see.

Sometimes vitamin E is used to lessen the harmful effects of medical treatments such as dialysis and radiation. It is also used to reduce unwanted side effects of drugs such as hair loss in people taking doxorubicin and lung damage in people taking amiodarone.

If you need take Vitamin E, you should pay more attention to it. Learning more health information, properties or suppliers about Vitamin E, you can access Guidechem. Guidechem chemical B2B network provides information on china and global chemical market quotation and relative chemical Information.

 Ketotifen fumarate is a second-generation noncompetitive H1-antihistamine and mast cell stabilizer. It is most commonly sold as a salt of fumaric acid, Ketotifen fumarate fumarate, and is available in two forms. In its ophthalmic form, it is used to treat allergic conjunctivitis,or the itchy red eyes caused by allergies. In its oral form, it is used to prevent asthma attacks. Side effects include drowsiness, weight gain, dry mouth, irritability, and increased nosebleeds.

Ketotifen fumarate (CAS NO:34580-14-8) is marketed as ophthalmic solutions under the brand names Zaditor/Zaditen, Alaway , Zyrtec Itchy-Eye Drops, and Claritin Eye. A generic version of Novartis' Zaditor, Ketotifen fumarate fumarate ophthalmic solution, 0.025%, is available from Perrigo and distributed as store brands, such as Eye Itch Relief from Walgreens.

Ketotifen fumarate (CAS NO:34580-14-8) is used to prevent and treat itching of the eyes caused by allergies. Ketotifen fumarate is an antihistamine for the eye that treats allergic symptoms by blocking a certain natural substance. It is also a mast cell stabilizer that prevents allergic reactions by reducing the release of natural substances that cause an allergic reaction.

If you are using the over-the-counter product, read all directions on the product package before using this medication. If your doctor has prescribed Ketotifen fumarate, use it exactly as directed.

Apply 1 drop to the affected eye(s), usually twice a day (every 8 to 12 hours) or as directed by the package instructions or your doctor. Dosage is based on your medical condition and response to treatment. To apply eye drops, wash your hands first. To avoid contamination, do not touch the dropper tip or let it touch your eye or any other surface.

For topical ophthalmic use only. Not for use on the skin, in the ear, or for injection into eye.Ask patient to tilt head back and instill prescribed number of drops into affected eye(s) as ordered. Ask patient to close eye(s) for 2 to 3 min and apply light finger pressure to lacrimal sac for 1 to 2 min after installation.

Do not touch top of dropper bottle to eye, fingers, or any other surface.If using other topical ophthalmic medications, separate each medication by at least 5 min. Instill ophthalmic ointment last.

Ketotifen fumarate relieves and prevents eye itchiness and/or irritation associated with most seasonal allergies. It starts working within minutes after administering the drops. Ketotifen fumarate has not been studied in children under three. The mean elimination half life is 12 hours. Besides its anti-histaminic activity, it is also a functional leukotriene antagonist and a phosphodiesterase inhibitor. Ketotifen fumarate may also help relieve the symptoms of Irritable bowel syndrome.

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 Acetaldehyde is a colorless volatile water-soluble liquid aldehyde C2H4O used chiefly in organic synthesis. The Molecular Weight is 44.05, it is stable, but air sensitive. Substances to be avoided include strong oxidizing agents, strong acids, reducing agents, alkalies, halogens, halogen oxides. Highly flammable. Vapour/air mixtures explosive over a very wide concentration range. May form peroxides in storage. The CAS Registry Number of Acetaldehyde is 75-07-0.

It was first observed by the Swedish pharmacist/chemist Carl Wilhelm Scheele; it was then investigated by the French chemists Antoine François, comte de Fourcroy and Louis Nicolas Vauquelin , and the German chemists Johann Wolfgang Döbereiner and Justus von Liebig. In 1835, Liebig named it "aldehyde"; the name was later altered to "acetaldehyde".

Acetaldehyde(CAS NO:75-07-0) is used as intermediate for syntheses of bulk chemicals, e.g. ethyl acetate, acetic acid, acetic anhydride, isooctylalcohol, pentaerythrite, pyridines, etc.

Acetaldehyde is mainly used as an intermediate in the synthesis of other chemicals. It is ubiquitous in the environment and may be formed in the body from the breakdown of ethanol. Acute (short-term) exposure to acetaldehyde results in effects including irritation of the eyes, skin, and respiratory tract.

Symptoms of chronic (long-term) intoxication of acetaldehyde resemble those of alcoholism. Acetaldehyde is considered a probable human carcinogen based on inadequate human cancer studies and animal studies that have shown nasal tumors in rats and laryngeal tumors in hamsters.

The predominant use of acetaldehyde is as an intermediate in the synthesis of other chemicals. Acetaldehyde is used in the production of perfumes, polyester resins, and basic dyes. It is also used as a fruit and fish preservative, as a flavoring agent, and as a denaturant for alcohol, in fuel compositions, for hardening gelatin, and as a solvent in the rubber, tanning, and paper industries.

Acetaldehyde is one of the most important aldehydes, occurring widely in nature and being produced on a large scale in industry. Acetaldehyde occurs naturally in coffee, bread, and ripe fruit, and is produced by plants.

Acetaldehyde is also produced by the partial oxidation of ethanol and may be a contributing factor to hangovers from alcohol consumption, produced in the liver by the enzyme alcohol dehydrogenase. Pathways of exposure include air, water, land, or groundwater, as well as drink and smoke.Consumption of disulfiram inhibits Acetaldehyde dehydrogenase, the enzyme responsible for the metabolism of Acetaldehyde, thereby causing it to build up in the body.

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1,4-Dioxane is a kind of Colorless clear liquids, it is also called 1,4-diethyleneoxide. The vapor pressure for 1,4-dioxane is 30 mm Hg at 20 C, the chemical formula of 1,4-dioxane is C4H8O2, and its molecular weight is 88.10 g/mol. It is stable, incompatible with oxidizing agents, oxygen, halogens, reducing agents, moisture. Highly flammable - note wide explosive range. May form explosive peroxides in storage. The CAS Registry Number is 123-91-1.

1,4-Dioxane is used mainly as a stabilizer for the solvent trichloroethane. It is an occasionally used solvent for a variety of practical applications as well as in the laboratory. It is used as a solvent for cellulose acetate, ethyl cellulose, benzyl cellulose, resins, oils, waxes, some dyes, and other organic and inorganic compounds.

1,4-Dioxane(CAS NO:123-91-1) ether is rather insoluble in water, whereas dioxane is miscible and in fact is hygroscopic. At standard pressure, the mixture of water and dioxane in the ratio 17.9:82.1 by mass is a positive azeotrope that boils at 87.6 C. 1,4-Dioxane is a versatile aprotic solvent. The oxygen atom is Lewis basic, so it is able to solvate many inorganic compounds. Because of its lower toxicity, it is substituted for tetrahydrofuran (THF) in some processes.

However, it has a higher boiling point (101 C versus 66 C for THF), which is important when reactions are to be conducted at a higher temperature.The oxygen centres are Lewis basic and so dioxane serves as a chelating diether ligand. It reacts with Grignard reagents to precipitate the magnesium dihalide.

1,4-dioxane is generated through a process called ethoxylation, in which ethylene oxide, a known breast carcinogen, is added to other chemicals to make them less harsh. This process creates 1,4-dioxane. For example, sodium laurel sulfate, a chemical that is harsh on the skin, is often converted to the less-harsh chemical sodium laureth sulfate.

The conversion process can lead to contamination of this ingredient with 1,4-Dioxane. Other common ingredients that may be contaminated by 1,4-Dioxane include PEG compounds and chemicals that include the clauses "xynol," "ceteareth" and "oleth". Most commonly, 1,4-Dioxane is found in products that create suds, like shampoo, liquid soap and bubble bath.

Environmental Working Group’s analysis suggests that 97 percent of hair relaxers, 57 percent of baby soaps and 22 percent of all products in Skin Deep may be contaminated with 1,4-Dioxane. Independent lab tests co-released by the Campaign for Safe Cosmetics in 2007 showed that popular brands of children’s bubble bath and body wash contained 1,4-Dioxane.

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