249288-18-4

Upstream product

• 13679-70-4 5-methylthiophene-2-carboxaldehyde 
• 100-44-7 benzyl chloride 
• 249288-13-9 6-chloro-3-hydroxy-2-(5'-methyl-2'-thienyl)-4-oxo-4H-1-benzopyran 

Relevant academic research and scientific papers

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

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.