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Dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) reacts under acidic conditions with orthoformates and alkyl alcohols to form 10-alkoxy-10H-9-oxa-10-phosphaphenanthrenes (1) in high yields. 10-Dialkoxymethyl-9-oxa-10-phosphaphenanthrene-10-oxides (2) were identified as side products and synthesized as main products by the modification of the reaction conditions.

A novel and efficient synthesis of trivalent 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide derivatives