Studies on Heterocyclic Compounds. IV. Geometrical Isomers of 2-(2, 6-Dichlorobenzylidenehydrazino)-1, 4, 5, 6-tetrahydropyrimidine Hydrochloride and Its Related Hydrazones

Abstract
The structure of a mild and durable antihypertensive agent, 2-(2,6-dichlorobenzylidenehydrazino)-1,4,5,6-tetrahydropyrimidine hydrochloride (IIIa) (OT-24), was established by nuclear Overhauser effect experiments. The anti-isomer (IIIa) easily isomerized to the syn-isomer by UV irradiation on aqueous and methanol solution. Several related hydrazones were synthesized and their configuration was examined.

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