Partial dehydrogenation of saturated 4-phenyl-1(2H)-phthalazinone derivatives by thionyl chloride

Article abstract of DOI:10.1080/00397919308011137

cis-4a,5,6,7,8,8a-Hexahydro-4-phenyl-1(2H)-phthalazinones (2) react with thionyl chloride in benzene to give tetrahydro derivatives (3); the corresponding reaction of methylene bridged derivatives (5) is also described.