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CAS No 74-93-1 , methanethiol

  • Name: methanethiol
  • Synonyms: Methylmercaptan; Thiomethanol; Thiomethyl alcohol; Methanthiol; Methyl sulfhydrate;methanethiol; METHYL MERCAPTAN; Mercaptomethane; Thiomethane;
  • CAS Registry Number:
  • Transport: UN 2037 2.3
  • Melting Point: −123 °C(lit.)
  • Boiling Point: 6 °C(lit.)
  • Density: 0.8665
  • Water Solubility: 2.4 g in 100 cm3
  • Safety Statements: Poison by inhalation. Mutation data reported. A common air contaminant. Very dangerous fire hazard when exposed to heat or flame; can react vigorously with oxidizing materials. Explosive in the form of vapor when exposed to heat or flame. Reacts with water, steam, or acids to produce toxic and flammable vapors. Violent reaction with mercury(II) oxide. To fight fire, use alcohol foam, CO2, dry chemical. Upon decomposition it emits highly toxic fumes of SOx. See also MERCAPTANS.Analytical Methods:   For occupational chemical analysis use OSHA: #26.
  • Hazard Symbols: Flammable, dangerous fire risk. Explosive limits in air 3.9–21.8%. Strong irritant. TLV: 0.5 ppm.
  • EINECS: 200-822-1
  • Molecular Weight: 48.10746
  • InChI: InChI=1S/CH4S/c1-2/h2H,1H3
  • Risk Statements: 12-23-50/53
  • Molecular Formula: CH4S
  • Molecular Structure:CAS No:74-93-1 methanethiol
References of methanethiol
Title: Methanethiol
CAS Registry Number: 74-93-1
Synonyms: Methyl mercaptan; mercaptomethane; thiomethyl alcohol; methyl sulfhydrate
Molecular Formula: CH4S
Molecular Weight: 48.11
Percent Composition: C 24.97%, H 8.38%, S 66.65%
Line Formula: CH3SH
Literature References: Occurs in "sour" gas of W. Texas, in coal tar, and in petroleum distillates. Isolated from roots of Raphanus sativus. Produced in the intestinal tract by the action of anaerobic bacteria on albumin. Evolved from Penicillium brevicaule bread cultures containing disulfides. Prepn from sodium methyl sulfate and KHS: Klason, Ber. 20, 3409 (1887); Arndt, ibid. 54, 2236 (1921); catalytically from methanol and hydrogen sulfide: Kramer, Reid, J. Am. Chem. Soc. 43, 880 (1921); from methyl chloride and sodium hydrosulfide: Scott et al., Ind. Eng. Chem. 47, 876 (1955). Review of occurrence, preparation, properties and reactions: E. E. Reid, Organic Chemistry of Bivalent Sulfur vol. I (Chemical Publishing Co., New York, 1958) pp 15-261; of toxicology and human exposure: Toxicological Profile for Methyl Mercaptan (PB93-110799, 1992) 92 pp.
Properties: Flammable gas; odor of rotten cabbage. mp -123°. bp760 5.95°; d420 0.8665; d425 0.9600. Critical temp 196.8°. Critical pressure 71.4 atm. Heat capacity (solid at 14.97-146.57 K): 0.773-17.47 cal/deg/mole; (liq at 154.16-271.06 K): 21.27-21.13 cal/deg/mole, Russell et al., J. Am. Chem. Soc. 64, 165 (1942). Azeotrope with isobutane (14.9% methanethiol) bp -13.00°. Soly in water at 20°: 23.30 g/l. Forms a cryst hydrate.
Melting point: mp -123°
Boiling point: bp760 5.95°; bp -13.00°
Density: d420 0.8665; d425 0.9600
Derivative Type: Sodium salt heminonahydrate
Molecular Formula: CH3SNa.4?H2O
Molecular Weight: 151.16
Percent Composition: C 7.95%, H 8.00%, S 21.21%, Na 15.21%, O 47.63%
Properties: Needles. Freely sol in water, methanol. Practically insol in ether.
Derivative Type: Copper salt
Molecular Formula: CH3SCu
Molecular Weight: 110.65
Percent Composition: C 10.85%, H 2.73%, S 28.98%, Cu 57.43%
Properties: Pale yellow crystals. Practically insol in water, ethanol, ether, benzene.
CAUTION: Potential symptoms of overexposure to methanethiol are irritation of eyes, skin and respiratory system; narcosis; cyanosis; convulsions; direct contact with liquid may cause frostbite. See NIOSH Pocket Guide to Chemical Hazards (DHHS/NIOSH 97-140, 1997) p 214.
Use: Intermediate in manuf of jet fuels, pesticides, fungicides, plastics; synthesis of methionine.