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The aryl-benzyl cross-coupling in the presence of copper-, nickel- and palladium-catalysts has been investigated with a number of chlorine- and methyl-substituted arylmetal compounds ArM (M=MgBr, ZnCl) and (substituted) benzylic halides ArCH 2 X. The results have been applied in the selective synthesis of some toxicologically interesting tetrachlorobenzyltoluenes.
Effective cleavage of PP bonds in red (and yellow) phosphorus can be brought about by adding tert-butyl alcohol to a mixture of phosphorus, lithium and liquid ammonia; subsequent addition of alkyl halides gives primary phosphines in good to excellent yields.
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