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Organo-silicon compounds S 0060Preparation of (Phenyldifluoromethyl)-and (Phenoxydifluoromethyl)-silanes by Magnesium-Promoted Carbon-Chlorine Bond Activation. -The title silanes (III) and (XIII) can easily be prepared by Mg-mediated treatment of the chlorides (I) and (XII) with Tms-Cl. They smoothly react with various electrophiles to afford fluoro compounds which are interesting building blocks. -(GUIDOTTI, J.; METZ, F.; TORDEUX, M.; WAKSELMAN*, C.; Synlett 2004, 10, 1759-1762; SIRCOB, CNRS, Univ. Versailles, F-78035 Versailles, Fr.; Eng.) -Jannicke 01-145