Abstract
The title benzoins are prepared and their photochemistry has been investigated. Product analysis studies indicate that the benzoin undergoes Norrish Type I photocleavage to generate benzoyl and benzyloxybenzyl radical, followed by thermal fragmentation to produce deoxybenzoin thereby generating benzyl radical. All three transient species are actually detected and characterized by laser flash photolysis of the benzoin in solution at room temperature. The efficiency of the benzoins as photoinitiator has been also investigated. Effects of ring substituents and polycyclic aromatic rings on the photoreactivity have been revealed.
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