【摘要】 从硬软酸碱理论出发对两可试剂的亲核性，取代反应中催化剂的选择性进行了综合的解释，指出了多官能团亲电反应中心，通过实例证明了离子型反应的选择性规律．更多还原

【Abstract】 The synthetic explanation of nucleophiticity of diagent and catalyst selection in substitution reaction is discussed according to hard-soft acid-base theory Electrphitic reaction center of multifunctional group is determined. The rule of selection in ionic reaction is proved through experimental examples.更多还原