Hydrogen—chloride exchange between organosilicon hydrides and polychloroalkanes catalyzed by ruthenium(II)-phosphine complexes

Add time:08/24/2019    Source:sciencedirect.com

Carbon tetrachloride, 1,1,1-trichloroethane, and 1,1,1,3-tetrachloroalkanes were selectively reduced by silicon hydrides to give chloroform, 1,1-dichloroethane, and 1,1,3-trichloroalkanes, respectively, in high yields in the presence of catalytic amounts of phosphine complexes of ruthenium(II) such as RuCl2(PPh3)3, RuHCl(PPh3)3, RuH2(PPH3)4, and RuH(SiMe2Cl)(PPh3)3. Reactivities of a wide variety of silicon hydrides towards the dechlorination also were estimated. The catalytic cycle can be explained in terms of successive oxidative addition, reductive elimination, and hydrogen—halogen exchange on the ruthenium—phosphine complex.

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