1781-66-4

Basic information

• Product Name: 4-bromocyclopentene
• CAS NO: 1781-66-4
• Molecular Formula: C₅H₇Br
• Molecular Weight: 147.0131
• Mol File: 1781-66-4.mol
• Article Data: 2

Chemical Properties

• Boiling Point: 143.2°C at 760 mmHg
• Flash Point: 37.2°C
• Density: 1.525g/cm³
• Vapor Pressure: 6.77mmHg at 25°C
• Refractive Index: 1.544
• CAS DataBase Reference: 4-bromocyclopentene(CAS DataBase Reference)
• NIST Chemistry Reference: 4-bromocyclopentene(1781-66-4)
• EPA Substance Registry System: 4-bromocyclopentene(1781-66-4)

Safety Data

• Hazardous Substances Data: 1781-66-4(Hazardous Substances Data)

Upstream product

• 185-94-4 bicyclo[2.1.0]pentane 
• 542-92-7 cyclopenta-1,3-diene 
• 75-62-7 Bromotrichloromethane 

Downstream Products

• 14320-38-8 cyclopent-3-enol 
• 79832-84-1 1,1'-bis{4-[(trans-4-pentyl)cyclohexyl]phenyl} 
• 25125-21-7 4-(hydroxymethyl)cyclopentene 
• 505058-38-8 3,3′,4,4′,5,5′-hexafluoro-1,1′-biphenyl 
• 599204-63-4 4-(3,4,5-trifluorophenyl)cyclopentene 
• 7686-77-3 3-cyclopentene-1-carboxylic acid 

Relevant articles and documents

Towards chiral non-racemic cis-1,3-disubstituted cyclopentane 1,4-diphosphines

Reaction of dialkyl- or diaryl-trans-(3,4-epoxycyclopentyl)phosphine oxides 2 with the lithium derivative of methyldiphenylphosphine oxide gives a mixture of (±)-t-4- and (±)-c-4-(disubstituted phosphinoyl)-t-2-(diphenylphosphinoylmethyl)-r-1-cyclopentanol derivatives 13a-c and 16a-c, which could be obtained in pure form by separation of the corresponding acetates 14a-c and 17a-c followed by methanolysis. Compounds 13b and 16b were transformed into the corresponding dehydroxy derivatives 19 and 21 through the Barton procedure. Additionally, 16a was transformed into a diastereomeric mixture of carbamates 22 and 23 on reaction with (S)-α-phenylethylisocyanate which could be separated by repeated crystallization. The relative configuration of compounds 13b, 17a, 21 and 22 was established by X-ray diffraction analysis.