For the hydrogenatlon of aromatic nitrocompounds, PdCl2 (TPPTS)2-H2PtCl6 ex-hibited much higher catalytic activity than that of PdCl2(TPPTS)2 or H2PtCl6. The synergic effect can also be observed even if the composition of Pt was 2% (molar ratio). A high selec-tivity for the chloroaniline was obtained in the hydrogenation of nitrochlorobenzene catalyzed by PdCl2 (TPPTS)2 and bimetallic catalyst PdCl2 (TPPTS)2-H2PtCl6.
Polymer-supported bimetallic system of PdCl2-4NiCl2-PPH3/PVP [PVP= poly(N-vinyl-2-pyrrolidone)] provided an almost regiospecific conversion of styrene to thebranched methyl 2-propionate at a high conversion. Typical reaction conditions are: 353 K,2.1 MPa of CO pressure (gauge pressure), 10h; styrene (1 mmol); methanol (0. 8 mL) ;benzene (10 mL); PdCl2/PVP(0. 04 mmol Pd, N/Pd= 20 in molar ratio); n (Pd): n(Ni): n(PPh3) = 1: 4:1. A remarkable synergic effect of bimetallic catalyst can be observed.Effects of PVP, amount of triphenylphosphine and temperature on the reaction were studied.The system of PdCl2-4NiCl2-PPh3/PVP gave 100% conversion of styrene and 99% selectivityto the branched chain ester under the typical reaction conditions.
