2-Methyl-2-propanethiol

Also known as: tert-Butylthiol, tert-Butyl mercaptan, t-Butyl mercaptan, 2-Methylpropane-2-thiol, 1,1-Dimethylethanethiol, 2-Isobutanethiol, TERT-BUTANETHIOL, TBM, tertiary-Butyl mercaptan

2-Methyl-2-propanethiol (CAS 75-66-1) is a compound in the Alcohols category listed in the Jingsj chemical database. It has the molecular formula C4H10S and a molecular weight of 90.187 g/mol. Key properties include a melting point of -1.1 °C, a boiling point of 67.0±8.0 °C at 760 mmHg, a density of 0.8±0.1 g/cm3 and a flash point of -24.4±0.0 °C. It is classified under GHS with signal word Danger and hazard statements H225 — Highly flammable liquid and vapour, H317 — May cause an allergic skin reaction and H411 — Toxic to aquatic life with long lasting effects. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 75-66-1
Jingsj CID: J-47447-6
Molecular Formula: C₄H₁₀S
Molecular Weight: 90.187 g/mol
Category: Alcohols
Last updated: 8/21/2026

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Physicochemical Properties

Melting Point	-1.1 °C
Boiling Point	67.0±8.0 °C at 760 mmHg
Density	0.8±0.1 g/cm3
Flash Point	-24.4±0.0 °C
Exact Mass	90.050323
PSA	38.80000
LogP	1.95
Additional Property	3.1 (vs air)
Vapor Pressure	160.1±0.1 mmHg at 25°C
Refractive Index	1.437

GHS Safety & Compliance

Flammable / Irritant / Environmental HazardSignal word: Danger

H225 — Highly flammable liquid and vapour
H317 — May cause an allergic skin reaction
H411 — Toxic to aquatic life with long lasting effects

Frequently Asked Questions

What is the CAS number of 2-Methyl-2-propanethiol?

The CAS number of 2-Methyl-2-propanethiol is 75-66-1.

What are the molecular formula and molecular weight of 2-Methyl-2-propanethiol?

2-Methyl-2-propanethiol has molecular formula C4H10S and molecular weight 90.187 g/mol.

Is 2-Methyl-2-propanethiol hazardous?

2-Methyl-2-propanethiol has GHS signal word Danger and hazard statements H225 — Highly flammable liquid and vapour; H317 — May cause an allergic skin reaction; H411 — Toxic to aquatic life with long lasting effects.

Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.

Last updated: 8/21/2026

How to cite: Jingsj. "2-Methyl-2-propanethiol (CAS 75-66-1)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-47447-6 (accessed 2026-11-07).

Data for reference only; verify product details with suppliers before purchase.