R. C. Kamboj, Geeta K. Sharma, Dinesh Kumar
Apr 1, 2012
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Comptes Rendus Chimie
Abstract
Abstract Photocyclisation of 3-alkoxy-6-chloro-2-(3-methylthiophen-2-yl)-4 H -chromen-4-ones in methanol with pyrex filtered UV-light lead to the formation of tetracyclic compounds through intramolecular γ-hydrogen abstraction. The methyl group on the thiophenyl ring does not interfere in the photocyclisation although it does effect the product formation.