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Supplementary Material Available:Plots of log (kx/kMe) vs electronegativity parameters and A* orbital energies (2 pages). Ordering information is given on any current masthead page. (29) Cram, D. J.; Abd Elhafez, F. A. J. Am. Chem. Soc. 1952, 74, (30) Cornforth, J. W.; Cornforth, R. H.; Mathew, K. K. J. Chem. Soc.(31) As an approximation of the magnitude of the angular effect, chargtdipole and dipoltdipole interactions have a cosine dependence, which requires a deviation of over 25' from 180° to alter the interaction by 10%: Hine, J.