Effects of Bridgehead Substitution on Structure and Reactivity of the 7-Norbornyl Cation
作者:D. E. Sunko、H. Vancik、Z. Mihalic、V. J. Shiner、F. P. Wiglis
DOI:10.1021/jo00102a033
日期:1994.11
A systematic investigation was undertaken of the effect of bridgehead substitution on the solvolytic reactivity of 7-norbornyl triflates in aqueous TFE. Methyl substitution increases the rate 60-fold and the effect of multiple substitution is additive. Chlorine, on the other hand, exhibits a combined inductive and resonance effect and decreases the reactivity 1700 times. The observed normal secondary P-deuterium isotope effect of the 1,4-d(2) derivative can be rationalized by assuming a tilted C-s geometry for the cationic transition structure which is only slightly higher in energy than the nonclassical intermediate cation of C-1 symmetry. Bridgehead methyl-d(3) kinetic isotope effects are similar to those associated with the nonmigrating methyl group in neopentyl ester solvolyses. These results are in agreement with the recently published structure of the 7-norbornyl cation calculated at the highest ab initio level which has confirmed its nonclassical nature as originally proposed by Winstein.
SALOMON, R. G.;COUGHLIN, D. J.;GHOSH, S.;ZAGORSKI, M. G., J. AMER. CHEM. SOC., 1982, 104, N 4, 998-1007
作者:SALOMON, R. G.、COUGHLIN, D. J.、GHOSH, S.、ZAGORSKI, M. G.
DOI:——
日期:——
KIRMSE W.; STREU J., J. ORG. CHEM., 52,(1987) N 4, 515-521