Acylation products of 5,5-diphenylimidazolid-4-one

Abstract
Acylation of 5,5-diphenylimidazolid-4-one gives 1,3-diacyl-5,5-diphenylimidazolid-4-ones, and not 2-acyl-4,4-diphenyl-2,5-diaza-7-oxabicyclo[3.2.0]heptan-3-ones as claimed by Biltz and his co-workers. The reason for the unusual stability of the N1-acyl groups to acid and alkaline hydrolysis is discussed. The revised formulation allows the oxidation products of 1-acetyl-5,5-diphenylimidazolid-4-one to be rationalized in a simple fashion.

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