一、引言超共轭效应在有机化学中广泛存在,由于它在液相中对有机反应的影响有时表现的很微弱,往往被溶剂化效应所掩盖,因此长期以来引起人们的怀疑和争论。但是超共轭效应的提出确实解释了许多用诱导效应和共轭效应难以解 I. INTRODUCTION The hyperconjugation effect exists widely in organic chemistry. Because of its weak influence on the organic reaction in the liquid phase, it often is concealed by the solvation effect, which has aroused people’s suspicion and debate for a long time. However, the proposal of hyperconjugation does explain many of the problems that are difficult to solve with induction and conjugation