VIBRATIONAL SPECTRUM AND CONFORMATION OF CYCLOPROPYLDIMETHYLBORANE

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1981

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Ohio State University

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The infrared (3500 to $50 cm^{-1}$) and Raman spectra (3500 to $10 cm^{-2}$) have been recorded for cyclopropyldimethylborane in both the gaseccus and solid states. Additionally, the Raman spectrum of the liquid was recorded and qualitative depolarization values have been obtained. Only one conformation has been found in all three physical states and, on the basis of the polarized nature of the Raman band assigned as the $BC_{2}$ antisymmetric stretch, this conformer is identified as being the bisected structure with $C_{3}$ molecular symmetry. A complete vibrational assignment, except for the $BC_{2}$ and two methyl torsional modes, will be given based on the depolarization data, infrared gas phase band contours, and group frequencies. These results will be compared to the corresponding data for cyclopropyldifluoroborane and cyclopropyldichloroborane.

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