Photochemistry of chromones: photoreorganisation of 3-alkoxy-2-thienyl-4-oxo-4 H-1-benzopyrans

SC Gupta, SN Dhawan

Index: Gupta, Satish C.; Sharma, Somesh; Saini, Ashok; Dhawan, Som N. Journal of the Chemical Society - Perkin Transactions 1, 1999 , # 16 p. 2391 - 2395

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Citation Number: 5

Abstract

Photoirradiation of a methanolic solution of 3-alkoxy-2-thienyl-4-oxo-4H-1-benzopyrans with Pyrex filtered UV light leads to cyclised and cyclodehydrogenated angular products involving both thiophene and alkoxy groups. The reaction is initiated through H-abstraction. The product distribution depends upon the substituents on the thiophene ring.