Stable Heterocyclic Five-membered Azomethine Imines: Azolium N-Imides, Triazolidinium and Pyrazolidinium Ylides

Abstract

This review described two types of stable heterocyclic five-membered azomethine imines Firstly, aromatic stabilized azomethine imines (azolium N-imides), containing the C-Nbond in a heteroaromatic five-membered ring.Secondly, non-aromatic stabilized compounds incorporating two N-atoms of the azomethine imine moiety in a five-membered ring and an exocyclic C-atom -triazolindione azomethine imines (or triazolindione ylides), pyrazolidone azomethine imines, and their analogues.Their preparation, structures, and some reactions are considered.CONTENTS I. Introduction 11.Synthesis and Reactions of Azolium imides (Type A) 111.Triazolidinium and Pyrazolidinium Ylides (Type B) References