Monatshefte fur Chemie p. 1167 - 1175 (2003)
Update date:2022-08-11
Topics:
Standfest-Hauser, Christina M.
Lummerstorfer, Thomas
Schmid, Roland
Kirchner, Karl
Hoffmann, Helmuth
Puchberger, Michael
The complexes [RuCp(CH3CN)2(Ph2PCH 2CH2Si(OMe)3)]PF6 and [RuCp(CH 3CN) (Ph2PCH2CH2Si(OMe) 3)2]PF6 were obtained in good yields by treatment of [RuCp(CH3CN)3]PF6 with 1 and 2 equivs of Ph2PCH2CH2Si(OMe)3. Both free Ph2PCH2CH2Si(OMe)3 and the two complexes were grafted onto the surface of powdered silica. The surface coverage was determined independently by 31P solid state NMR and IR spectroscopy. IR data revealed that for Ph2PCH2CH 2Si(OMe)3 and the complexes 52, 52, and 18 molecules, respectively, were immobilized per 100 nm2 of SiO2 surface. Similar values were obtained from 31P MAS NMR measurements. With the immobilized first complex the catalytic redox isomerization of allyl alcohol to propanal has been studied by means of IR spectroscopy and 1H NMR spectroscopy showing the quantitative formation of aldehyde. While in the first cycle satisfactory turnover numbers were achieved, the subsequent cycles showed only low conversions to aldehyde presumably due to decomposition of the complex. The immobilized second complex was catalytically inactive.
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