期刊
ADVANCED SYNTHESIS & CATALYSIS
卷 356, 期 4, 页码 673-679出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adsc.201400125
关键词
CH activation; heterogenous catalysis; iridium; organic-inorganic hybrid materials; periodic mesoporous organosilicas; surface chemistry
With the goal to obtain a molecularly defined iridium(I) heterogeneous CH functionalization catalyst, a periodic mesoporous organosilica (PMO) containing bipyridylene moieties in a matrix of biphenylene units as ligand platform was designed and fully characterized. The material exhibits a high surface area with small mesopores in a vermicular arrangement, and the pore walls show a highly crystal-like character. After surface passivation with chlorotrimethylsilane and functionalization with chloro(1,5-cyclooctadiene)iridium(I) dimer [{IrCl(COD)}(2)] a molecularly defined Ir(I) surface complex was obtained according to EXAFS and UV-Vis spectroscopy. This functionalized material catalyzes the direct CH borylation of arenes to yield the corresponding boronic esters and can be reused without significant loss of activity.
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