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Vibrational spectra and structure of halogen-substituted cyclopropanes. IV–cis- and trans- 1,2-dibromocyclopropane

✍ Scribed by G. Schrumpf; H. Dunker

Publisher
John Wiley and Sons
Year
1986
Tongue
English
Weight
317 KB
Volume
17
Category
Article
ISSN
0377-0486

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✦ Synopsis

The infrared and Raman spectra of cis-and trans-1,2-dibromocyclopropane have been measured in the liquid phase from 4000 to 50 cm-'. An assignment of all fundamentals of the two isomers is proposed which is in accord with all the well established assignments of simple bromocyclopropanes and disubstituted halocyclopropanes. Evidence has been obtained for an attractive interaction between the two bromine substituents in the ecliptic position as encountered in the cis isomer.

CH stretchings and bendings. There are three resolvable bands in the CH region above 3000 cm-' where cyclopropane CH stretches are usually observed. The only depolarized band is definitely due to the antisymmetric CH2 stretch, and the polarized strong line at 3006 cm-', very weak in the infrared, to the symmetric CH, stretch.

EXPERIMENTAL

Cis-and truns-i,2-dibromocyclopropane were synthesized by the Cristol reaction from trans-cyclopropane-* Author to whom corrcspondence should be addressed.

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