trans-2-Pentene

Description

trans-2-Pentene · CAS 646-04-8 · C5H10. UNII YCO1SJQ98H. Boiling Point: 36.3 °C; Melting Point: -140.2 °C; Flash Point: less than -4 °F (NFPA, 2010).

Identification

CAS Registry Number	646-04-8
PubChem CID	5326161
Molecular formula	C5H10
IUPAC name	(E)-pent-2-ene
UNII (FDA)	YCO1SJQ98H

Computed Descriptors

Molecular Weight	70.13
XLogP3	2.1
Hydrogen Bond Donor Count	0
Hydrogen Bond Acceptor Count	0
Rotatable Bond Count	1
Exact Mass	70.078250319
Monoisotopic Mass	70.078250319
Topological Polar Surface Area	0
Heavy Atom Count	5
Formal Charge	0

Physical & Chemical Properties

Boiling Point	36.3 °C
Melting Point	-140.2 °C
Flash Point	less than -4 °F (NFPA, 2010)
Solubility	In water, 203 mg/l @ 25 °C
Density	0.6431 @ 25 °C/4 °C
Density	Density: 0.6482 @ 20 °C/4 °C; 0.5824 @ 80 °C/4 °C; 0.6675 @ 0 °C/4 °C
Vapor Density	2.4 (Air= 1)
Vapor Pressure	506.0 [mmHg]
Vapor Pressure	5.06X10+2 mm Hg @ 25 °C
Surface Tension	16.41 dyne/cm @ 25 °C

Physical description & handling notes

• 2-pentene, (e)- is a colorless liquid with a hydrocarbon odor. Usually in technical grade as a mixture of isomers. Used as a solvent, in organic synthesis, and as a polymerization inhibitor.
• Liquid; bp = 36.3 deg C; [HSDB] Colorless liquid with an odor of hydrocarbons; Technical grade is mixture of isomers; [CAMEO] Colorless liquid; bp = 36-37 deg C; [MSDSonline]
• Liquid
• BELOW -4 °F (BELOW -20 °C) (CLOSED CUP)
• Soluble in benzene; miscible in ethanol, ethyl ether
• When heated to decomposition it emits acrid smoke and irritating fumes.

Regulatory Status

GHS notification summary	1.2% (1 / 84)

GHS Hazard Classification

GHS notification summary	1.2% (1 / 84)
Reported hazard statements	H224 (75%), H225 (23.8%), H302 (26.2%), H304 (70.2%), H315 (56%), H319 (56%), H332 (26.2%), H335 (54.8%)

Documented Uses

• Used as a polymerization inhibitor, solvent, and to make petroleum resins and sec-amyl alcohols; [HSDB]
• Polymerization inhibitor; organic synth /2-Pentene/
• CHEM INT FOR PETROLEUM RESINS (AS MIXED PENTENES)
• CHEM INT FOR SEC-AMYL ALCOHOLS (ISOMERIC MIXT)
• Prepn of mixture of cis & trans isomers by dehydration of 2-pentanol ... Prepn of the ... trans form from 1-ethyl-2-iodobutyric acid with sodium carbonate ... prepn of both isomers from sec-amyl alc with H2SO4 and diatomaceous earth @ 90-110 °C for 3 hr
• CRACKING OF PETROLEUM DISTILLATES FOLLOWED BY SEPARATION

Synonyms

trans-2-Pentene; 646-04-8; (E)-2-Pentene; (E)-pent-2-ene; 2-PENTENE; 2-Pentene, (E)-; Methylbut-1-ene; 2-Pentene, (2E)-; (2E)-2-Pentene; 3-Pentene; MFCD00009384; sym-Methylethylethylene; EINECS 261-403-7; YCO1SJQ98H; 58718-78-8; trans-beta-Amylene

Frequently Asked Questions

What are the CAS number and molecular formula of trans-2-Pentene?

CAS 646-04-8; molecular formula C5H10; molecular weight — g/mol.

What other names is trans-2-Pentene known by?

trans-2-Pentene, 646-04-8, (E)-2-Pentene, (E)-pent-2-ene, 2-PENTENE, 2-Pentene, (E)-.

Is trans-2-Pentene classified as hazardous?

1.2% of GHS notifications report no hazard classification (1 of 84).

What are the key physical properties of trans-2-Pentene?

Boiling Point: 36.3 °C; Melting Point: -140.2 °C; Flash Point: less than -4 °F (NFPA, 2010); Solubility: In water, 203 mg/l @ 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.