2,3-Butanediol

Description

2,3-Butanediol · CAS 513-85-9 · C4H10O2. UNII 45427ZB5IJ. Boiling Point: BP: 182 °C at 1 atm; Boiling Point: 182.00 °C. @ 760.00 mm Hg; Melting Point: 19 °C.

Identification

CAS Registry Number	513-85-9
PubChem CID	262
Molecular formula	C4H10O2
IUPAC name	butane-2,3-diol
UNII (FDA)	45427ZB5IJ

Computed Descriptors

Molecular Weight	90.12
XLogP3	-0.9
Hydrogen Bond Donor Count	2
Hydrogen Bond Acceptor Count	2
Rotatable Bond Count	1
Exact Mass	90.068079557
Monoisotopic Mass	90.068079557
Topological Polar Surface Area	40.5
Heavy Atom Count	6
Formal Charge	0

Physical & Chemical Properties

Boiling Point	BP: 182 °C at 1 atm
Boiling Point	182.00 °C. @ 760.00 mm Hg
Melting Point	19 °C
Melting Point	25 °C
Flash Point	85 °C
Flash Point	85 °C (185 °F) - closed cup
Solubility	1000 mg/mL at 20 °C
Density	1.045 at 20 °C/20 °C
Vapor Density	3.1 (Air = 1)
Vapor Pressure	0.24 [mmHg]

Physical description & handling notes

• Nearly colorless solid or liquid; Hygroscopic; [HSDB] Semi-solid that melts to clear colorless liquid; mp = 25 deg C; [MSDSonline]
• Solid
• Nearly colorless, crystalline solid or liquid
• Odorless
• Sweet taste
• 185 °F - open cup

Regulatory Status

Regulatory & Food Contact	EU Flavoring substances Flavoring Agents CIR / INCI: Cosmetic ingredients (2,3-Butanediol) -> CIR (Cosmetic Ingredient Review)
GHS notification summary	94.5% (208 / 220)

GHS Hazard Classification

GHS notification summary	94.5% (208 / 220)
Reported hazard statements	H227

Documented Uses

• Used in resins, as a solvent for dyes, as a blending agent, and as a crosslinking agent for naphthalene-1,5-diisocyanate in the production of specific hard-rubber products; [HSDB]
• Resins, solvent for dyes, intermediate, blending agent.
• 2,3-Butanediol (at least 80% meso isomer, the rest racemic mixture) is used as a crosslinking agent for naphthalene-1,5-diisocyanate in the production of specific hard-rubber products (Vulkollan). Derivatives of 2,3-butanediol are important as insecticides (Sapecron: acetal with methylcarbamate of salicylic aldehyde) and as intermediates in the pharmaceutical industry. 2,3-Butanediols have some interest as humectants and in the synthesis of polymers and plasticizers.
• EPA Safer Chemical Functional Use Classes -> Solvents
• Safer Chemical Classes -> Green circle - The chemical has been verified to be of low concern
• After removal of butadiene and isobutene from crack gases, a C4 hydrocarbon fraction, called C4 raffinate II, is obtained, which contains approximately 77% butenes and 23% of a mixture of butane and isobutane. By chlorohydrination of this fraction with a solution of chlorine in water and subsequent cyclization of the chlorohydrins with sodium hydroxide, a butene oxide mixture of the following composition is obtained: 55% trans-2,3-butene oxide, 30% cis-2,3-butene oxide, and 15% 1,2-butene oxide. Hydrolysis of this

Synonyms

2,3-butanediol; 513-85-9; Butane-2,3-diol; 2,3-butylene glycol; 2,3-Dihydroxybutane; Dimethylethylene glycol; Pseudobutylene glycol; Sym-dimethylethylene glycol; DTXSID8041321; DTXCID6021321; CHEBI:62064; 45427ZB5IJ; RefChem:441921; 208-173-6; Dimethylene glycol; DL-2,3-Butanediol

Frequently Asked Questions

What are the CAS number and molecular formula of 2,3-Butanediol?

CAS 513-85-9; molecular formula C4H10O2; molecular weight — g/mol.

What other names is 2,3-Butanediol known by?

2,3-butanediol, 513-85-9, Butane-2,3-diol, 2,3-butylene glycol, 2,3-Dihydroxybutane, Dimethylethylene glycol.

What is the regulatory status of 2,3-Butanediol?

Documented regulatory listings: EU Flavoring substances; Flavoring Agents; CIR / INCI: Cosmetic ingredients (2,3-Butanediol) -> CIR (Cosmetic Ingredient Review).

Is 2,3-Butanediol classified as hazardous?

94.5% of GHS notifications report no hazard classification (208 of 220).

What are the key physical properties of 2,3-Butanediol?

Boiling Point: BP: 182 °C at 1 atm; Boiling Point: 182.00 °C. @ 760.00 mm Hg; Melting Point: 19 °C; Melting Point: 25 °C.

Facts on this page are taken from PubChem (US National Library of Medicine) and Wikidata. Grade-specific data — assay, moisture, particle size, packaging, shelf life — is issued per batch on the COA and is not published here.