Azines of the Isoquinoline Series: III. Reactions of Substituted 1-Hydrazono-3,4-dihydroisoquinolines with Dicarbonyl Compounds

3,3-Dimethyl-1-hydrazono-1,2,3,4-tetrahydroisoquinoline derivatives react with benzil in 1 : 1 or 2 : 1 ratio to give the corresponding benzil monohydrazones. Diacetyl under the same conditions forms dihydrazones. Enolizing 1,3-dicarbonyl compounds form with 3,3-dimethyl-1-hydrazono-1,2,3,4-tetrahydroisoquinoline derivatives mixtures of mono- and dihydrazones. Dehydracetic acid forms monohydrazones at the exochain carbonyl group.