期刊
POLYHEDRON
卷 116, 期 -, 页码 12-19出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.poly.2016.02.044
关键词
Alkane; Alkene; Dehydrogenation; Homogeneous catalysis; Iridium
资金
- National Basic Research Program of China [2015CB856600]
- National Natural Science Foundation of China [21432011, 21422209]
- National Science Foundation as part of the Center for Enabling New Technologies through Catalysis (CENTC), Phase II Renewal [CHE-1205189]
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [1205189] Funding Source: National Science Foundation
A series of new ((PSCOPR2)-P-tBu2)IrHCl iridium complexes with 'hybrid' phosphinothious-phosphinite PSCOP ligands ([(PSCOPR2)-P-tBu2 = (SPtBu2)-3-(OPR2)-C6H4], R = tBu, 4a, R = Cy, 4b, R = iPr, 4c, and R = Et, 4d) have been synthesized and characterized. Treatment of complexes 4a-d with sodium tert-butoxide generates the active species for catalytic transfer-dehydrogenation of cyclooctane (COA) or n-octane using tert-butylethylene (TBE) as hydrogen acceptor to form cyclooctene (COE) or octenes, respectively. The catalytic activity of these complexes and the product selectivity in alkane dehydrogenation is greatly influenced by the steric properties of the pincer ligand. In general, the less sterically bulky complex exhibits higher catalytic activity than the more hindered complex. Among the new (PSCOP)Ir-type complexes, the least crowded complex ((PSCOPEt2)-P-tBu2)IrHCl 4d is most active for n-octane/TBE transfer-dehydrogenation. The relatively crowded, less active, complexes ((PSCOPtBu2)-P-tBu2)IrHCI (4a) and ((PSCOPCy2)-P-tBu2)IrHCI (4b) exhibit high regioselectivity for alpha-olefin formation at the early stages of the reaction. (C) 2016 Elsevier Ltd. All rights reserved.
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