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A series of poly(ethylene glycol) biscoumarinyloxyacetates have been synthesized and their intramolecular photochemical cyclodimerizations have been studied.It was found that only syn-HT configuration products were obtained when these bisesters were directly irradiated in chloroform,and the yields of the products decreased with the increase of the chain length.This photocyclization reaction is a convenient and effective method to synthesize macrocyclic compounds.
A series of poly (ethylene glycol) biscoumarinyloxyacetates have been synthesized and their intramolecular photochemical cyclodimerizations have been studied. It was found that only syn-HT configuration products were obtained when these bisesters were directly irradiated in chloroform, and the yield of the products decreased with the increase of the chain length.This photocyclization reaction is a convenient and effective method to synthesize macrocyclic compounds.