Synthesis, immobilization and catalytic activity of some silylated cyclopentadienyl rhodium(I) complexes
摘要:
The mixture of isomers of silylated cyclopentadiene derivative C5H5CH2CH2Si(OMe)(3) (1) has been used for the syntheses of the mononuclear Rh(I) complexes [eta(5)-C5H4(CH2)(2)Si(OMe)(3)]Rh(CO)(2) (3), [eta(5)-C5H4(CH2)(2)Si(OMe)(3)]Rh(COD) (4) and [eta(5)-C5H4-(CH2)(2)Si(OMe)(3)]Rh(CO) (PPh3) (5). Upon entrapment of 3-5 in silica sol-gel matrices, air stable, leach-proof and recyclable catalysts 6-8 resulted. Their catalytic activities in some hydrogenation processes were compared with those of the non-immobilized complexes, 3-5, as well as with those of homogeneous and heterogenized non-silylated analogs, 9-14. (C) 1998 Elsevier Science S.A. All rights reserved.