cis-2-Pentene

Description

cis-2-Pentene · CAS 627-20-3 · C5H10. UNII 54UR3XZ4FC. Boiling Point: 36.9 °C; Melting Point: -151.4 °C; Flash Point: less than -4 °F (NFPA, 2010).

Identification

CAS Registry Number	627-20-3
PubChem CID	5326160
Molecular formula	C5H10
IUPAC name	(Z)-pent-2-ene
UNII (FDA)	54UR3XZ4FC

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	36.9 °C
Melting Point	-151.4 °C
Flash Point	less than -4 °F (NFPA, 2010)
Solubility	In water, 203 mg/l @ 25 °C
Density	0.6556 @ 20 °C/4 °C
Density	Density: 0.6503 @ 20 °C/4 °C; 0.5824 @ 80 °C/4 °C; 0.6392 @ 30 °C/4 °C; 0.6170 @ 0 °C/4 °C
Vapor Density	2.4 (Air= 1)
Vapor Pressure	495.0 [mmHg]
Vapor Pressure	4.95X10+2 mm Hg @ 25 °C
Surface Tension	16.80 dyne/cm @ 25 °C

Physical description & handling notes

• 2-pentene, (z)- appears as a colorless liquid with a hydrocarbon odor. Usually found as a technical grade consisting of a mixture of isomers. Insoluble in water. Used as a solvent in organic synthesis and as a polymerization inhibitor.
• Colorless liquid; Technical product usually a mixture of isomers; [CAMEO]
• Liquid
• BELOW -4 °F (BELOW -20 °C) (CLOSED CUP)
• Soluble in benzene; miscible in ethanol and ethyl ether
• Index of refraction: 1.3830 °C/D

Regulatory Status

GHS notification summary	1.4% (1 / 73)

GHS Hazard Classification

GHS notification summary	1.4% (1 / 73)
Reported hazard statements	H225 (98.6%), H300 (30.1%), H304 (65.8%), H310 (30.1%), H315 (56.2%), H319 (56.2%), H330 (30.1%), H335 (54.8%)

Documented Uses

• Used as polymerization inhibitor, solvent, and chemical intermediate; [HSDB]
• Polymerization inhibitor; organic synthesis /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
• CRACKING OF PETROLEUM DISTILLATES FOLLOWED BY SEPARATION

Synonyms

cis-2-PENTENE; 627-20-3; (Z)-Pent-2-ene; 2-Pentene, (Z)-; cis-Pentene; cis-beta-N-Amylene; 2-Pentene, (2Z)-; beta-Amylene-cis; cis-beta-Amylene; cis-.beta.-Amylene; HSDB 5725; 54UR3XZ4FC; EINECS 210-988-7; 2-PENTENE, CIS-; CIS-2-PENTENE [HSDB]; 2-PENTENE (Z)-FORM [MI]

Frequently Asked Questions

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

CAS 627-20-3; molecular formula C5H10; molecular weight — g/mol.

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

cis-2-PENTENE, 627-20-3, (Z)-Pent-2-ene, 2-Pentene, (Z)-, cis-Pentene, cis-beta-N-Amylene.

Is cis-2-Pentene classified as hazardous?

1.4% of GHS notifications report no hazard classification (1 of 73).

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

Boiling Point: 36.9 °C; Melting Point: -151.4 °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.