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|Type:||Artigo de periódico|
|Title:||Hydrogenation And Isomerization Of 1-hexene With Ru3(co)9(pph2ch2ch2 Si(ome)3)3 Immobilized In Silica Matrices Via The Sol-gel Method|
|Abstract:||Ru3(CO)9(PPh3)3 and Ru3(CO)9(PPh2CH2CH2 Si(OMe)3)3 have been heterogenized in silica matrices by the sol-gel method. Gels prepared with Ru3(CO)9(PPh2CH2CH2 Si(OMe)3)3 were tested in the hydrogenation and isomerization of 1-hexene. At H2-pressures of 16psi in repeated runs (15h, 90°C) turnover numbers for 1-hexene hydrogenation were between 380 and 460. Isomerization products were trans-2-hexene, cis-2-hexene and trans-3-hexene. No cis-3-hexene, 2-methyl-1-pentene and 2-methylpentane were found. Leaching of ruthenium in each run was around 0.05% of ruthenium present in the original gel. UV-VIS and FT-IR spectra of the pure cluster compounds and the gels before and after the catalytic reactions showed that during the gel preparation some Ru3 units remain intact, but are cleaved when the gel is heated under vacuum or used in catalytic hydrogenation reactions. © 2002 Elsevier Science B.V. All rights reserved.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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