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4-Aroyl-6-phenylpyridazin-3(2 H)-ones (4a—c) were synthesized by the oxidation of the corresponding 4-arylmethyl-6-phenylpyridazin-3(2H)-ones (3a—c) using sodium dichromate in glacial acetic acid. The reactions of 4a—c with hydrazine hydrate and hydroxylamine hydrochloride proceeded smoothly to give the corresponding hydrazones (5) and oxime (6). 4a—c reacted with dimethyl sulphate to give 4-aroyl-2-methyl-6-phenylpyridazin-3(2 H)-ones (7a—c), respectively while their reaction with phosphorus oxychloride gave 4-aroyl-3-chloro-6-phenylpyridazines (9a—c), respectively.

Novel Synthesis of 4-Aroyl-6-phenylpyridazin-3(2 H)-ones