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A Covalently Immobilized Triphenylphosphine Rhodium Complex: Synthesis, Characterization, and Application in Catalytic Olefin Hydrogenation
Author(s) -
Wang Lei,
Jia Mingjun,
Shylesh Sankaranarayanapillai,
Philippi Thomas,
Seifert Andreas,
Ernst Stefan,
Singh Anand Pal,
Thiel Werner R.
Publication year - 2010
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201000133
Subject(s) - rhodium , catalysis , olefin fiber , triphenylphosphine , chemistry , heterogeneous catalysis , covalent bond , mesoporous material , selectivity , nanoparticle , metal , combinatorial chemistry , organic chemistry , polymer chemistry , materials science , nanotechnology
A trimethoxysilane functionalized triphenylphosphine was coordinated to rhodium(I) and the resulting rhodium complex was covalently bound to a mesoporous SBA‐15 support. The catalytic activity of this hybrid material was studied for the hydrogenation of 2‐cyclohexen‐1‐one and compared with the corresponding homogeneous catalyst. According to the 31 P‐MAS NMR data, the catalytically active species was stable against oxidation; no structural change could be detected after exposing it to air for more than two months. Transmission electron microscopy (TEM) measurements on the used catalyst confirmed that the rhodium species was also stable against reduction to the metal because the formation of rhodium nanoparticles during the catalysis could be excluded. The kinetic curves of the recycled system confirmed that this hybrid catalyst shows excellent activity, selectivity, stability, and reusability, and is truly heterogeneous in the hydrogenation reaction.