A detailed study of the competition between CC, CH, and C-Si bond fragmentation in a series of 4-methoxy-α-substituted toluene radical cations (1+), involving both product studies and kinetic analysis, is presented. CC bond fragmentation occurs with several radical cations in acetonitrile. The rate constants for such processes, determined by laser flash photolysis, varied from 2.8× 104 (1c+) to 1.53× 106 (1f+) s-1. The activation parameters for ...
