PHOTOCHEMICAL REACTIONS OF 7-AMINOCOUMARINS 1. -CYCLOADDUCTS WITH VINYL BUTYL ETHER AND ACRYLONITRILE
Adducts of -cycloaddition to the 3-4 bond were isolated in the photochemical cycloaddition of vinyl butyl ether and acrylonitrile to 4-methyl-7-diethylaminocoumarin.The stereochemical structures of the compounds obtained as isomers of the "head-to-tail" type with an endo or exo orientation of the substituents were established by means of PMR spectroscopy.As a result of an evaluation of the effect of sensitizers and one-electron oxidizing and reducing agents it was found that the investigated reactions proceed through the singlet excited states of 7-aminocoumarins.It is assumed that the regiospecifity of the -cycloaddition is determined by the C(3) reaction center of the coumarin fragment.
Kirpichenok, M. A.,Mel'nikova, L. M.,Denisov, L. K.,Grandberg, I. I.
p. 959 - 965
(2007/10/02)
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