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DOI: 10.1055/s-1996-4355
Insertion of α-Phosphorylcarbene Moiety into S-S and Se-Se Bonds: Synthesis of Dithio- and Diselenoacetals of Formylphosphonates
Publikationsverlauf
Publikationsdatum:
31. Dezember 2000 (online)
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Reaction between diazomethanephosphonates and disulfides or diselenides catalyzed by boron trifluoride - diethyl ether complex leads to insertion of the (RO)2P(O)-CH(:) moiety into S-S and Se-Se bonds, respectively. The proposed method makes it possible to synthesize 2-phosphoryl-substituted 1,3-diselenanes, not available by other means. The yield depends on the reaction conditions. Stereoselectivity of insertion into cyclic systems is discussed. Reactions catalyzed by rhodium(II) acetate or anhydrous copper(II) sulfate afford the relevant sulfides, (RO)2P(O)-CH2SR. The possible ionic and free radical mechanistic pathways are presented.
insertion - dithioacetals - diselenoacetals - formylphosphonates - 1,3-diselenanes