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(S)-(+)-2-Butanol

Also known as: (2S)-butan-2-ol, (S)-butan-2-ol, (S)-2-butanol, (S)-(+)-sec-Butanol, (S)-(+)-sec-Butyl alcohol, D-(+)-Ethylmethylcarbinol, D-(+)-SEC-BUTYL ALCOHOL

(S)-(+)-2-Butanol (CAS 4221-99-2) is a compound in the Alcohols category listed in the Jingsj chemical database. It has the molecular formula C4H10O and a molecular weight of 74.122 g/mol. Key properties include a melting point of -114ºC, a boiling point of 96.6±3.0 °C at 760 mmHg, a density of 0.8±0.1 g/cm3 and a flash point of 26.7±0.0 °C. It is classified under GHS with signal word Warning and hazard statements H226 — Flammable liquid and vapour, H319 — Causes serious eye irritation and H335 — May cause respiratory irritation. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.
4221-99-2
Jingsj CID
J-10839-4
Molecular Formula
C4H10O
Molecular Weight
74.122 g/mol
Category
Alcohols
Last updated
8/21/2026
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Physicochemical Properties

Melting Point-114ºC
Boiling Point96.6±3.0 °C at 760 mmHg
Density0.8±0.1 g/cm3
Flash Point26.7±0.0 °C
Exact Mass74.073166
PSA20.23000
LogP0.69
Vapor Pressure25.2±0.3 mmHg at 25°C
Refractive Index1.393

GHS Safety & Compliance

Flammable / IrritantSignal word: Warning
  • H226 — Flammable liquid and vapour
  • H319 — Causes serious eye irritation
  • H335 — May cause respiratory irritation
  • H335 — May cause respiratory irritation
  • H336 — May cause drowsiness or dizziness
  • H336 — May cause drowsiness or dizziness

Frequently Asked Questions

What is the CAS number of (S)-(+)-2-Butanol?

The CAS number of (S)-(+)-2-Butanol is 4221-99-2.

What are the molecular formula and molecular weight of (S)-(+)-2-Butanol?

(S)-(+)-2-Butanol has molecular formula C4H10O and molecular weight 74.122 g/mol.

Is (S)-(+)-2-Butanol hazardous?

(S)-(+)-2-Butanol has GHS signal word Warning and hazard statements H226 — Flammable liquid and vapour; H319 — Causes serious eye irritation; H335 — May cause respiratory irritation.

What are the upstream and downstream products of (S)-(+)-2-Butanol?

For (S)-(+)-2-Butanol, Upstream Products: 1,2-epoxybutane, cis-2-butene, 2-butene; Downstream Products: (S)-(+)-1-Methylpropyl 4-methylbenzenesulfonate, 2-Butanol, (2S)-6-Methylheptan-2-ol.

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

Last updated:

How to cite: Jingsj. "(S)-(+)-2-Butanol (CAS 4221-99-2)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-10839-4 (accessed 2026-11-09).

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