Geometric Isomers of 2-Aryl(Aralkyl)-4-arylidene(alkylidene)-5(4H)-oxazolones

The chemistry of geometric isomers of 4-arylidene(alkylidene)-5(4H)-oxazolones with reference to methods for their preparation, their physical and chemical properties, and configurational assignments is discussed. 1. Scope of the Review 2. Introduction 3. Methods of Preparation of Geometric Isomers 4. Mechanism of Isomerization 5. Differences in Isomer Properties 5.1. Physical Properties 5.2. Chemical Properties 6. Structure Proof by Degradation 7. Configuration of Geometric Isomers 8. Note added in Proof