Dehydrogenative vacuum pyrolysis: a novel synthetic technique. Conversion of cyclo-octa-1,5-diene into styrene and related reactions
Abstract
Vacuum pyrolysis in the presence of palladium on charcoal of the 3,3-dioxide (1) of 3-thiabicyclo[3.2.0]-heptane-6,7-dicarboxylic anhydride gave, without undesirable disproportionation, phthalic anhydride, also obtained from cis-2,3-divinylsuccinic anhydride (2) and cis-1,2,3,6-tetrahydrophthalic anhydride (5), while cyclo-octa-1,5-diene (7) and the disulphone (6) each gave styrene.