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    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Linear Oligophosphaalkanes, XIX1). - Partial Alkylation of Phenylphosphane with Dihalomethanes CH2X2 (X = Cl, Br) - A facile Synthesis of Methylenebis(phenylphosphane), HPhP—CH2—PPhHThe reaction of PhPHNa with CH2X2 (X = Cl, Br) in tetrahydrofuran affords methylenebis(phenylphosphane), HPhP—CH2—PPhH (2), phenylphosphane, methylphenylphosphane, PhPHMe, and 1,2,3,4-tetraphenylcyclo-5-carba-1,2,3,4-tetraphosphane, CH2(PPh)4 (3). HPhP—CH2—PPhH (2) may be obtained in a facile one-step synthesis with yields up to 70% by reaction of PhPH2 with CH2Cl2 and KOH in dimethyl sulfoxide/H2O or dimethylformamide/H2O. The formation of PhPHMe and CH2(PPh)4 may be explained by a reaction scheme including P-phenylphosphaalkene PhP=CH2 and HPhP—CH2Cl as reactive intermediates. The reactions between PhPHM (M = Na, K) and CH2Cl2 or CH2Br2, respectively, have been studied by independent experiments.
    Notes: Die Umsetzung von PhPHNa mit CH2X2 (X = Cl, Br) in Tetrahydrofuran liefert neben Methylenbis(phenylphosphan), HPhP—CH2—PPhH (2), Phenylphosphan, Methylphenylphosphan, PhPHMe, und 1,2,3,4-Tetraphenylcyclo-5-carba-1,2,3,4-tetraphosphan, CH2(PPh)4 (3). Auf überraschend einfache Weise und in Ausbeuten bis zu 70% gelingt die Synthese von HPhP—CH2—PPhH (2) durch Umsetzung von PhPH2 mit CH2Cl2 und KOH in Dimethylsulfoxid/H2O bzw. Dimethylformamid/H2O. Das Auftreten von PhPHMe und CH2(PPh)4 deutet auf die intermediäre Bildung des reaktiven P-Phenylphosphaalkens PhP=CH2 aus dem Primärprodukt HPhP—CH2Cl him. Der Ablauf der Reaktion zwischen PhPHM (M = Na, K) und CH2Cl2 bzw. CH2Br2 wurde durch unabhängige Experimente aufgeklärt.
    Type of Medium: Electronic Resource
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