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(a) A different strategy for catalysis in for catalysis in EDA complex photochemistry: a donor catalyst that aggregates with an additive to form a radical promoter (A·), which is responsible to generate reactive radicals: here, none of the EDA partners is incorporated in the product’s structure. (b) Photochemical synthesis of benzo[b]phosphole oxides triggered by HAT agent XXXVI, generated upon light excitation of EDA-25; HAT: hydrogen atom transfer.
