THE VINYL TORSION IN SOME SUBSTITUTED STYRENES

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1976

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Ohio State University

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The low frequency torsional overtone ($\Delta\nu = 2$) of the vinyl group has been observed in the gas phase Raman spectra of m- and p-chlorostyrene, m- and p-fluorostyrene and p-methylstyrene. The calculated barriers to internal rotation are all slightly smaller than for styrene itself. It appears that the conventional resonance and induction arguments used in explaining the reactions of para-substituted aromatics play no role in the ground electronic states of these molecules. The slight downward trend in the barriers may he explained in terms of a small increase in non-dominant steric forces.

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This research was performed for the U. S. Energy Research and Development Administration under Contract No. W-7405-Eng-82.
Author Institution: Department of Chemistry, University of Georgia

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