Secondary effect on barriers to rotation in substituted ethanes

JE Anderson, H Pearson

Index: Anderson,J.E.; Pearson,H. Journal of the American Chemical Society, 1975 , vol. 97, p. 764 - 769

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Citation Number: 28

Abstract

Abstract: The temperature-dependent nmr spectra for a number of closely related substituted ethanes have been studied by full line shape analysis to give barriers to rotation. These range from 10.4 to 13.8 kcal mol-'. The variation in barriers cannot be explained satisfactorily by primary steric effects alone. The data are best rationalized on the basis of a compression effect operating in the eclipsed transition state.'