Kolancilar, HOyman, Ü2024-06-122024-06-1220030019-4522https://hdl.handle.net/20.500.14551/24886Attempts were made to synthesise the benzocoumarin and benzochromone systems by Pechmann reaction. As an extension, it was also planned to make bi- and bis-derivatives of these compounds. 2,7-Dihydroxy naphthalene (DHN) and ethyl acetoacetate (EAA) were chosen as starting materials and 80% H2SO4, PPA and HClO4 were used as condensing agents. H2SO4 gave a benzochromone with a low yield together with isomeric benzocoumarins. PPA gave angular benzocoumarin and benzochromone but no linear benzocoumarin was obtained. When HClO4 was employed the isomeric benzocoumarins were obtained with no indication of the formation of benzochromone ring. Attempts were also made to couple some of the compounds synthesised. Only one bi-benzocoumarin was obtained in one case. No angular benzocoumarin and angular benzochromone compounds gave the coupling reaction. Also, to obtain bis-derivatives, the Mannich reaction was applied.eninfo:eu-repo/semantics/closedAccessCondensationCoumarinsChlorideArticle809853857Q4WOS:000223694600014