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Substance Name: Methyl mercaptan
RN: 74-93-1
UNII: 2X8406WW9I
InChIKey: LSDPWZHWYPCBBB-UHFFFAOYSA-N

Note

  • Intermediate in the manufacturing of jet fuels, pesticides, fungicides, plastics, synthesis of methionine; odor may cause nausea; narcotic in high concentrations; depresses urea biosynthesis.

Molecular Formula

  • C-H4-S

Molecular Weight

  • 48.1086
 

Classification Codes

Classification Codes

  • Mutation Data
  • TSCA Flag T (Subject to the Section 4 Test Rule under TSCA)

Superlist Classification Codes

  • Ceiling 10 ppm (20 mg/m3)
  • Reportable Quantity (RQ) = 100 lb
  • Threshold Planning Quantity (TPQ) = 500 lb
  • TWA (0.5 ppm)

Names and Synonyms

Name of Substance

  • Methyl mercaptan
  • Methylmercaptan

Synonyms

  • 4-01-00-01273 (Beilstein Handbook Reference)
  • BRN 1696840
  • EC 200-822-1
  • EINECS 200-822-1
  • FEMA No. 2716
  • HSDB 813
  • Mercaptan methylique
  • Mercaptan methylique [French]
  • Mercaptomethane
  • Methaanthiol
  • Methaanthiol [Dutch]
  • Methanethiol
  • Methanthiol
  • Methanthiol [German]
  • Methvtiolo
  • Methvtiolo [Italian]
  • Methyl mercaptan
  • Methyl mercaptan (natural)
  • Methyl sulfhydrate
  • Methylmercaptaan
  • Methylmercaptaan [Dutch]
  • Methylmercaptan
  • Metilmercaptano
  • Metilmercaptano [Italian]
  • Metilmercaptano [Spanish]
  • RCRA waste number U153
  • Thiomethanol
  • Thiomethyl alcohol
  • UN 1064
  • UNII-2X8406WW9I

Systematic Name

  • Methanethiol

Superlist Names

  • Methanethiol
  • Methyl mercaptan
  • Methyl mercaptan [UN1064] [Poison gas]
  • RCRA waste no. U153
  • Thiomethanol
  • UN1064

Registry Numbers

CAS Registry Number

  • 74-93-1

FDA UNII

  • 2X8406WW9I

Other Registry Numbers

  • 505027-72-5
  • 63933-47-1

Related Registry Numbers

  • 21094-80-4 (mercury(2+) salt)
  • 35029-96-0 (lead(2+) salt)
  • 5188-07-8 (hydrochloride salt)

System Generated Number

  • 0000074931

Structure Descriptors

InChI

1S/CH4S/c1-2/h2H,1H3

InChIKey

LSDPWZHWYPCBBB-UHFFFAOYSA-N

Smiles

CS

Toxicity

Organism Test Type Route Reported Dose (Normalized Dose) Effect Source
mammal (species unspecified) LD50 unreported 60670ug/kg (60.67mg/kg)   Gigiena Truda i Professional'nye Zabolevaniya. Labor Hygiene and Occupational Diseases. Vol. 16(6), Pg. 46, 1972.
mouse LC50 inhalation 6530ug/m3/2H (6.53mg/m3)   Gigiena Truda i Professional'nye Zabolevaniya. Labor Hygiene and Occupational Diseases. Vol. 16(6), Pg. 46, 1972.
rat LC50 inhalation 675ppm (675ppm) GASTROINTESTINAL: "HYPERMOTILITY, DIARRHEA"

LUNGS, THORAX, OR RESPIRATION: OTHER CHANGES

KIDNEY, URETER, AND BLADDER: URINE VOLUME INCREASED
Personal Communication from H.B. Lackey, Chemical Products Div., Crown Zellerbach, Camas, WA 98607, June 9, 1978Vol. 09JUN1978,

Physical Properties

Physical Property Value Units Temp (deg C) Source
Melting Point -1.23E+02 deg C   EXP
Boiling Point 5.9 deg C   EXP
pKa Dissociation Constant 10.33 (none) 25 EXP
log P (octanol-water) 0.780 (none)   EST
Water Solubility 1.54E+04 mg/L 25 EXP
Vapor Pressure 1510 mm Hg 25 EXP
Henry's Law Constant 3.12E-03 atm-m3/mole 25 EST
Atmospheric OH Rate Constant 3.29E-11 cm3/molecule-sec 25 EXP

Physical property data is provided to ChemIDplus by SRC, Inc.