Die Methylendiketone (I) reagieren in Gegenwart von Alkali mit Dibutylphosphinigsäure (II) zu Dibutylphosphinmethyldiketonen (III) bzw. auch zu dem Halbacetal (IVa).
Aus den 1,5‐Diketonen (I) werden beim Erhitzen mit äquimolaren Mengen Phenylphosphin (II) in Gegenwart von I‐ICl die 3‐Benzoyl‐1‐oxophosphorinane (III) gebildet.
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Die Anlagerung des Dimethylphosphits (II) an das 2‐Methylen‐l ,5‐diketon (I) erfolgt an der Methylengruppe, wobei die bicyclische Hydrdxyverbindung (III) entsteht.
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