New aroyl diphenyl phosphines (If-i) substituted with n-functions in ortho-positions of the aroyl part have been synthesized and photolyzed in benzene. In two cases (lh and i) 1.2-and 1.4-addition products of photochemically formed diphenylphosphinous acid (3) with acetone or phenanthrene quinone (8) are isolated in 59% yields. Moreover. in neighboring-group participations aroyl radicals formed by competing a-cleavages of Ig-i yield 5-and 6-membered hetero-and carbocycles: xanthone (6). 3,3'-dimethoxy 3.3'-diphthalidyl (7). or the phenanthrene derivative 9. respectively. Neue Aroyl-diphenylphosphine (If-i) mit ortho-standigen n-Funktionen werden synthetisiert und in Benzol photolysiert. Dabei werden in zwei Fallen (lh und i) in 59-proz. Ausbeuten 1.2-bzw. 1.4-Additionsprodukte aus photochemisch gebildeter Diphenylphosphinigsaure (3) an Aceton bzw. Phenanthrenchinon (8) erhalten. Aroyl-Radikale aus konkurrierender a-Spaltung von lg-i liefern durch Nachbargruppenwechselwirkung 5-und 6-gliedrige Hetero-und Carbocyclen: Xanthon (6). 3.3'-Dimethoxy-3.3'-diphthalidyl (7), bzw. das Phenanthren-Derivat 9.
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