butenyne

Description

butenyne · CAS 689-97-4 · C4H4. UNII VW72FM10OQ. Boiling Point: 5.1 °C @ 760 mm Hg; Solubility: In water, 1.79X10+3 mg/l @ 30 °C; Density: 0.7095 @ 0 °C/0 °C.

Identification

CAS Registry Number	689-97-4
PubChem CID	12720
Molecular formula	C4H4
IUPAC name	but-1-en-3-yne
UNII (FDA)	VW72FM10OQ

Computed Descriptors

Molecular Weight	52.07
XLogP3	1.3
Hydrogen Bond Donor Count	0
Hydrogen Bond Acceptor Count	0
Rotatable Bond Count	0
Exact Mass	52.0313001276
Monoisotopic Mass	52.0313001276
Topological Polar Surface Area	0
Heavy Atom Count	4
Formal Charge	0

Physical & Chemical Properties

Boiling Point	5.1 °C @ 760 mm Hg
Solubility	In water, 1.79X10+3 mg/l @ 30 °C
Density	0.7095 @ 0 °C/0 °C
Vapor Density	1.80 (AIR= 1)
Vapor Pressure	1,350 mm Hg @ 25 °C

Physical description & handling notes

• 1-buten-3-yne appears as a colorless gas or liquid. Derived by the dimerization of acetylene. Used in the synthesis of neoprene and for other organic syntheses.
• Liquid
• Colorless gas or liquid; [HSDB]
• Colorless gas or liquid
• acetylene-like odor
• Sol in benzene

GHS Hazard Classification

Reported hazard statements	H220 (100%), H280 (100%)

Documented Uses

• Used as an intermediate in the manufacture of neoprene and other organic compounds; [HSDB]
• Intermediate in mfr of neoprene and for various organic syntheses
• The dimer of acetylene, formed by passing it into a soln of cuprous and ammonium chlorides in hydrochloric acid.
• 2023: 1,000,000 - <8,500,000 lb

Synonyms

1-BUTEN-3-YNE; Vinylacetylene; But-1-en-3-yne; Vinyl acetylene; Butenyne; Monovinylacetylene; 689-97-4; 1-Butenyne; 3-Buten-1-yne; Ethene, ethynyl-; 1-Butyn-3-ene; Vinylethyne; HSDB 5743; EINECS 211-713-3; VW72FM10OQ; 3-BUTYN-1-ENE

Frequently Asked Questions

What are the CAS number and molecular formula of butenyne?

CAS 689-97-4; molecular formula C4H4; molecular weight — g/mol.

What other names is butenyne known by?

1-BUTEN-3-YNE, Vinylacetylene, But-1-en-3-yne, Vinyl acetylene, Butenyne, Monovinylacetylene.

Is butenyne classified as hazardous?

Hazard statements reported: H220, H280.

What are the key physical properties of butenyne?

Boiling Point: 5.1 °C @ 760 mm Hg; Solubility: In water, 1.79X10+3 mg/l @ 30 °C; Density: 0.7095 @ 0 °C/0 °C; Vapor Density: 1.80 (AIR= 1).

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.