SUPPORTED ORGANOMETALLIC COMPLEXES - PART-XIII - CATALYTIC STUDIES ONSOL-GEL PROCESSED (ETHER PHOSPHINE)RUTHENIUM(II) COMPLEXES WITH DIFFERENT SPACER LENGTHS AND DIFFERENT POLYSILOXANE MATRICES

The monomeric (ether-phosphine) ruthenium complexes cis-(H)ClRu(CO)(P similar to O)(3) (1a(T-0)(3)), (1b(T-0)(3)), and (1c(T-0)(3)) (P simil ar to O: P-coordinated PhP(CH2CH2OCH3)(CH2)(x)Si(OMe)(3); x = 3 (a), 6 (b), 8 (c)) were immobilized by the sol-gel process under the employm ent of the cocondensates Si(OEt)(4) (Q(0)), MeSi(OMe)(3) (T-0), and Me 2Si(OEt)(2) (D-0) to give the nine different polymer-bound (ether-phos phine) ruthenium complexes 1(a,b,c)(T-n)(3)(Q(h),T-m,D-i)(v) (y = numb er co-condensed Q, T or D type: Q = Q type silicon atom (four oxygen n eighbors). T = T type silicon atom (three oxygen neighbors), D = D typ e silicon atom (two oxygen neighbors); i, k, n, m = number of Si-O-Si bonds: i = 0-2; n, m = 0-3; k = 0-4) with three different polysiloxane matrices and three different spacers. The immobilized complexes were studied in their catalytic behavior with respect to the hydrogenation of n-butenal. The results demonstrate that the catalytic activity is d ependent upon the type of matrix and the type of spacer of the polymer anchored catalysts. (C) 1998 Elsevier Science B.V.