SCHEDULED MAINTENANCE
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.
S. C. Gupta, S. Sharma, A. Saini and S. N. Dhawan, J. Chem. Soc., Perkin Trans. 1, 1999, 2391 DOI: 10.1039/A901090D
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