VIBRATIONAL SPECTRA AND THE CONFORMATIONAL BEHAVIOR OF ETHYLCYCLOPROPANE, ISOP;ROPYLCYCLOPROPANE AND ETHYLOXIRANE
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Date
1979
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Ohio State University
Abstract
Infrared and Raman spectra of the title compounds have been recorded in all three phases. From the spectral data, ethylcyclopropane has been shown to exist solely in the gauche conformation. Similarly, isopropylcyclopropane exists solely in one conformation also - in this case the s-trans form due to the presence of the two methyl groups of the isopropyl substituent. On the other hand, ethyloxirane exists as an equilibrium mixture of the two nonequivalent gauche conformers. In all cases, steric repulsions between the methyl hydrogens and the $\beta$ ring hydrogens preclude the existence of possible rotamers where them ethyl group is situated over the three membered ring. Tentative vibrational assignments have been proposed for the major spectral peaks of all three molecules.
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