Interesting phototransformations of aziridinylmaleates and -fumarates. Steady-state and laser flash photolysis studies
摘要:
The phototransformations of some disubstituted aziridylmaleates 3a-d and -fumarates 4a-c have been studied by steady-state photolysis, product analysis, and by laser flash photolysis. The formation of the different pyrrolidone derivatives in these reactions could be understood in terms of azomethine ylide intermediates 5a-d, which undergo facile 1,2-rearrangements leading to Schiff bases and their subsequent cyclization, followed by further transformations. Laser flash photolysis studies substantiate the formation of azomethine ylide intermediates from these substrates under direct irradiation; however, they are not formed under triplet sensitization by aromatic ketones. Geometric isomerization of the ethylenic diester moiety takes place both under direct and sensitized irradiations.
Interesting phototransformations of aziridinylmaleates and -fumarates. Steady-state and laser flash photolysis studies
作者:D. Ramaiah、K. Ashok、R. Barik、D. Venugopal、N. P. Rath、K. Bhattacharyya、P. K. Das、M. V. George
DOI:10.1021/jo00048a045
日期:1992.10
The phototransformations of some disubstituted aziridylmaleates 3a-d and -fumarates 4a-c have been studied by steady-state photolysis, product analysis, and by laser flash photolysis. The formation of the different pyrrolidone derivatives in these reactions could be understood in terms of azomethine ylide intermediates 5a-d, which undergo facile 1,2-rearrangements leading to Schiff bases and their subsequent cyclization, followed by further transformations. Laser flash photolysis studies substantiate the formation of azomethine ylide intermediates from these substrates under direct irradiation; however, they are not formed under triplet sensitization by aromatic ketones. Geometric isomerization of the ethylenic diester moiety takes place both under direct and sensitized irradiations.