Reactions of 1-phenyl-5-arylazo-4-thiohydantoin derivatives with grignard reagents, acrylonitrile and chloroacetic acid

Addition of organomagnesium compounds to the conjugation created by the attachment of an exocyclic double bond to a heterocyclic nitrogen ring, having a carbonyl function, has been reported in the case of 5-arylidene-2-thiohydantoin [la], and 5-arylidene-4-thiohydantoin [Ib] yielding the corresponding saturated derivatives [2]