PHOTOCHEMICAL REACTION OF 7-AMINOCOUMARINS. 9. -CYCLOADDUCTS WITH trans,trans-1,4-DIPHENYL-1,3-BUTADIENE

Article abstract of DOI:10.1007/BF00472176

The photoreactions of 7-diethylaminocoumarin, 4-methyl-7-diethylaminocoumarin, 4-trifluoromethyl-7-diethylaminocoumarin, and 4-N-morpholino-7-diethylaminocoumarin with trans,trans-1,4-diphenyl-1,3-butadiene, which lead to the formation of <2 + 2>-cycloaddition products, were studied.It was established that photocycloaddition proceeds with the formation of adducts that have a 1-endo-styryl substituent and a 2-exo-phenyl group.The effect of the substituent in the 4-position of the 7-aminocoumarin molecule on the effectiveness of cycloaddition is discussed.