Nomenclature
CAS number: 540-49-8
1,2-Dibromoethene; 1,2-dibromoethylene;
sym-dibromoethylene.
C
2H
2Br
2; mol wt 185.85.
C 12.93%, H 1.08%, Br 85.99%.
BrCH=CHBr.
Description and references
Prepd by reaction of tetrabromoethylene with
Zn and alc followed by sepn of cis- and trans-forms by fractional distillation: Noyes et al., J. Am. Chem. Soc. 72, 33 (1950).
Properties
Liquid, gradually decomposed by air, moisture,
or light. d417 2.21. nD20 1.5428. Practically
insol in water. Sol in many organic solvents.Derivative
cis-Form.
Properties
nD25 1.5370.Derivative
trans-Form.
Properties
nD25 1.5440.Caution
Narcotic in high concns.