Add time:08/13/2019         Source:sciencedirect.com

Reactions of [Cp*RhCl2]2 with 1,1′-bis(diphenylphosphinomethyl)ferrocene (dpmf) or 1,1′-bis(diphenylphosphino)ferrocene (dppf) gave the bridged complex [Cp*RnCl2]2(μ-diphos) (1: diphos=dpmf; 2: diphos=dppf). Reaction with dppf in the presence of NaPF6 gave the cationic chelated [Cp*RhCl(dppf-P,P′)](PF6) complex 3. Complex 1 reacted with xylyl isocyanide (XylNC) in the presence of NaPF6 to yield [Cp*2Rh2Cl2(μ-dpmf)(XylNC)2](PF6)2, 4, in low yield. [Cp*Rh(dppf-P,P′)(MeCN)](PF6)2, 5a, was prepared from 3, NaPF6 and AgNO3 in MeCN. The acetonitrile ligand in this complex was replaced readily with Lewis bases (L), such as CO and isocyanides, to form [Cp*Rh(dppf-P,P′)(L)](PF6)2, 5. Structures of 2, 3 and 5d (L=p-TosCH2NC) were confirmed by X-ray analyses, in which their molecules have the piano stool structure.

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