75-66-1
Product Name:
2-Methyl-2-propanethiol
Formula:
C4H10S
Synonyms:
tert-Butyl mercaptan;TBM
Inquiry
CHEMICAL AND PHYSICAL PROPERTIES
Physical Description | Tert-butyl mercaptan is a foul-smelling organosulfur compound which is a colorless, clear liquid at ambient temperatures. It is primarily used as an odorant for natural gas, and it has an odor threshold of less than 0.33 ppb. Non-toxic at the very low concentrations used in natural gas, but the smell can cause nausea at concentrations as low as 2-3 ppm. The pure chemical is highly flammable and may cause skin and eye irritation upon direct exposure. |
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Color/Form | Mobile liquid |
Odor | Heavy skunk odor |
Boiling Point | 149-153 °F at 760 mmHg (NFPA, 2010) |
Melting Point | -32 °F (ICSC, 2023) |
Flash Point | less than -20 °F (NFPA, 2010) |
Solubility | Insoluble (NFPA, 2010) |
Density | 0.8 (NFPA, 2010) - Less dense than water; will float |
Vapor Density | 3.1 (NFPA, 2010) - Heavier than air; will sink (Relative to Air) |
Vapor Pressure | 142.5 mmHg at 68 °F (ICSC, 2023) |
Stability/Shelf Life | Remarkably stable to oxidizing agents. |
Decomposition | The substance decomposes on burning producing toxic gases including sulfur oxides. |
Odor Threshold | Odor Threshold Low: 0.00081 [mmHg] The Guide in the Emergency Response Guidebook is for "Butyl mercaptan." Odor threshold (100% recognition) from CHEMINFO |
Refractive Index | Index of refraction: 1.41984 at 25 °C/D |
Dissociation Constants | pKa = 11.22 at 25 °C |
Kovats Retention Index | 584 594 595 587 589 |
Other Experimental Properties | WT/GALLON: 6.71 LB; DISTILLATION RANGE: 62-67 °C |
Chemical Classes | Other Classes -> Thiols |
SAFETY INFORMATION
Signal word | Danger |
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Pictogram(s) |
Flame Flammables GHS02 Exclamation Mark Irritant GHS07 Environment GHS09 |
GHS Hazard Statements |
H225:Flammable liquids H317:Sensitisation, Skin H411:Hazardous to the aquatic environment, long-term hazard |
Precautionary Statement Codes |
P210:Keep away from heat/sparks/open flames/hot surfaces. — No smoking. P233:Keep container tightly closed. P240:Ground/bond container and receiving equipment. P273:Avoid release to the environment. P280:Wear protective gloves/protective clothing/eye protection/face protection. P303+P361+P353:IF ON SKIN (or hair): Remove/Take off Immediately all contaminated clothing. Rinse SKIN with water/shower. |
COMPUTED DESCRIPTORS
Molecular Weight | 90.19 g/mol |
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XLogP3 | 1.5 |
Hydrogen Bond Donor Count | 1 |
Hydrogen Bond Acceptor Count | 1 |
Rotatable Bond Count | 0 |
Exact Mass | 90.05032149 g/mol |
Monoisotopic Mass | 90.05032149 g/mol |
Topological Polar Surface Area | 1 Ų |
Heavy Atom Count | 5 |
Formal Charge | 0 |
Complexity | 25.1 |
Isotope Atom Count | 0 |
Defined Atom Stereocenter Count | 0 |
Undefined Atom Stereocenter Count | 0 |
Defined Bond Stereocenter Count | 0 |
Undefined Bond Stereocenter Count | 0 |
Covalently-Bonded Unit Count | 1 |
Compound Is Canonicalized | Yes |
PRODUCT INTRODUCTION
description
Tert-butyl mercaptan is a foul-smelling organosulfur compound which is a colorless, clear liquid at ambient temperatures. It is primarily used as an odorant for natural gas, and it has an odor threshold of less than 0.33 ppb. Non-toxic at the very low concentrations used in natural gas, but the smell can cause nausea at concentrations as low as 2-3 ppm. The pure chemical is highly flammable and may cause skin and eye irritation upon direct exposure.