Conformational Isomerism of N2H4 and Derivatives. The Stereochemical Consequences of “Forbiddenness” Removal

Abstract

According to Molecular Orbital-Valence Bond (MOVB) theory,1 the vast majority of organic molecules in a reference geometry can be viewed as the result of a “forbidden” union of a core(C) and a ligand(L) fragment.1–3 The transition from the reference geometry to the lowest energy geometry of the molecule is accompanied by an energy reduction which is a reflection of “forbiddeness” removal.4 The purpose of this paper is to focus on one and only one type of system, namely, A2X4 with fourteen valence electrons, in order to demonstrate how radically MOVB theory has changed our view of molecular stereochemistry.