Improved syntheses of tetraphenylphosphonium bromide and 1-phenyldibenzophosphole are described. Also described are syntheses of tetrakis(p-chlorophenyl)phosphonium bromide, tetrak is (p-tolyl)phosphonium bromide, 1-phenyldi-benzophosphole oxide, 1-phenyldibenzophosphole sulfide, 1-phenyldibenzophosphole selenide and 5-p-tolyl-2,8-dimethyldibenzophosphole oxide. These compounds were all characterized by elemental analyses and 31P {1H} NMR spectroscopy. An investigation of the relative catalytic efficiencies of NiBr2, [Ph2PH]4Ni and (Ph3P)2Ni(CO)2 in the synthesis of 1-phenyldibenzophosphole is also reported.
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Affandi et al. (1987) studied this question.
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