VIBRATIONAL SPECTROSCOPY OF TRANS-3,4-DIFLUOROCYCLOBUTENE
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Date
1991
Journal Title
Journal ISSN
Volume Title
Publisher
Ohio State University
Abstract
The new substance, trans-3,4-dilluorocyclobutene, has been obtained by distilling cis-3,4-dichlorocyclobutene through a short packing of a mixture of $AgF_{2}$ and KF. cis-and trans-3-chloro-4 fluorocyclobutene are isolatable intermediates. Very little of the cis isomer of difluorocyclobutene is formed in this reaction. From gas-phase and glassy-phase infrared spectra and a liquid-phase Raman spectrum, a complete assignment of the vibrational fundamentals of trans-3,4-dilluorocyclobutene has been made. This molecule has $C_{2}$ symmetry and has an estimated $\alpha$ of -0.47. The totally symmetric modes have B-type shapes in the gas-phase infrared spectrum. The fundamentals are in $cm^{-1}$; (a) 3106, 2977, 1559, 1354, 1193, 1169, 1143, 1038, 993, 931, 601, 309, 184; (b) 3088, 2977, 1332, 1298, 1198, 1064, 970, 844, 684, 426, 326. Correlations with the assignments for trans-3,4-dichlorocyclobutene are $good.^{1}$ The ring-puckering mode of 184 $cm^{-1}$ fits well the emerging pattern for halogen-substituted cyclobutenes.
Description
$^{1}$N. C. Craig, S. E. Hawley and C. L. Perry, Spectrochim. Acta, 47,000 (1991).""
Author Institution: Department of Chemistry, Oberlin College
Author Institution: Department of Chemistry, Oberlin College