N. Turro, J. Mattay
Jul 15, 1981
Citations
0
Influential Citations
31
Citations
Journal
Journal of the American Chemical Society
Abstract
The photolyses of 1,2-diphenyl-2-methyl-1-propanone (1) and its D-, /sup 13/C-, and alkyl-substituted derivatives 2 to 5 in various micellar solutions have been investigated. It was found that the extent of cage disproprotionation to yield benzaldehydes 6 and ..cap alpha..-methylstyrenes 7 is enhanced by a factor of about 10 compared to the photolyses in homogeneous organic solvents. The advantage of using micelles rather than homogeneous solutions to enhance the magnitude of magnetic isotope and magnetic field effects on cage disproportionation is demonstrated. The results are interpreted in terms of a mechanism involving the competition between hyperfine-induced intersystem crossing of a triplet radical pair (/sup 3/RP) to form a singlet radical pair (/sup 1/RP) and escape of /sup 3/RP from the micelle.