Abstract
Abstract A benzene ring substituted with two acyl groups in ortho-position was built from α-dicarbonyl compounds and dibenzyl ketone via Diels-Alder reaction of the intermediate cyclopentadienones with 1,2-diaroyl acetylenes and subsequent decarbonylation. The polycycles which were synthesized in this way formed interesting new [c]-annellated thiophenes on reaction with tetraphosphorus decasulfide (P4S10).
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