Reagents trialkyl silanes

In related chemistry, the borane/silane catalytic system can cleanly dealkylate phosphonic and phosphinic esters RPO(OR,)2 or R2PO(OR/) to give silyl esters with trialkyl silanes.259 If more active silane reagents like Ph2SiH2 or PhSiH3 are employed, catalytic reduction to primary or secondary phosphines is observed. Mechanistic experiments strongly support a silane activation pathway for this chemistry. 

Alkyl halides, including bcnzylic and allylic halides, do not react with trimethyl(trifluoro-methyl)silane. even with molar amounts of tetrabutylammonium fluoride.47 A convenient method has been developed48 for the perfluoroalkylation of organic (aryl, vinyl, benzyl and allyl) halides, e.g. formation of l.48 4g using a mixture of trialkyl(perfluoroalkyl)silane/potas-sium fluoride/copper in dimethylformamide. Under these conditions perfluoroalkylcopper RFCu reagents are produced in situ. 

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