Chemiluminescence in the infrared photochemistry of oxetanes: the formal reverse of ketone photocycloaddition
作者:William E. Farneth、Douglas G. Johnson
DOI:10.1021/ja00318a074
日期:1984.3
the photochemical cycloaddition of biacetyl and acetone, respectively, with ethylvinylether. The oxetanes were irradiated in the gasphase with the collimated beam of a grating-tuned CO/sub 2/ TEA laser. Reaction conditions employed 0.1 torr of oxetane and 1 J/cm/sup 2/ fluence with a beam dia of 6 mm, constant through the cell at a frequency of 969.15/cm. Progress of the reaction was followed by monitoring
photoaddition of biacetyl, a ketone having a visible absorbing chromophore, and a series of alkenes in benzene solution. Biacetylphosphorescencequenching and quantum yield data are consistent with a photoaddition mechanism involving biacetyl triplets. Exciplex and biradical intermediates are proposed for photoaddition on the basis of stereochemical results and the dependence of phosphorescencequenching constants