Structural Dualism in the Zwitterionic 7-RR'NH-nido-7,8,9-C_3B_8H_(10) Tricarbollide Series:An Example of Absolute Tautomerism

摘要

Tautomerism,which is a dynamic equilibrium between two or more alternative structures of a single species,has been observed for many organic compounds.The commonest case of tautomerism,known as prototropy,is when the electrofuge (a leaving group that does not carry away the bonding electron pair) is a proton.This phenomenon is typical for compounds that contain a functional group that is able to donate a proton,and another functional group which is able to accept it,the functional groups must be in the same molecule and in close enough proximity to one another.