Abstract
Rates of 9,10-dimethylanthracene (DMA) formation have been determined for N 2-purged solutions of 9,10-peroxy-9, 10-dimethylanthracene (DMAPO) and benzene ( B) in dichloromethane at 254 nm as a function of concentration of DMAPO and of B. The rate equation is integrated to accommodate time-dependent absorption of the actinic radiation by DMA, necessary even for cycloreversions of 1%. The data are quantitatively consistent with triplet benzene sensitized adiabatic cycloreversion from the endoperoxide triplet (T π) state with an estimated efficiency of 0.16 ± 0.06.
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