Introduction

Fluxional molecules are molecules where intermolecular rearrangements carry a molecule from one nuclear configuration to another and we detect the rearrangement then the molecule is designated stereochemically non-rigid. · where 2 or more configurations are not chemically equivalent then the interconversion is called isomerisation. · where 2 or more configurations are chemically equivalent then the interconversion is called fluxionality. · the problem is how to observe these processes.