期刊
APPLIED ORGANOMETALLIC CHEMISTRY
卷 25, 期 4, 页码 276-282出版社
WILEY
DOI: 10.1002/aoc.1754
关键词
carbene complexes; organometallic compounds; palladium; transmetallation; hydrogenation
资金
- Netherlands Organization for Scientific Research (NWO), Taiwan-Netherlands [053.68.003]
The synthesis of an air-stable series of Pd-0 complexes with unsymmetric bidentate N-pyridine N-heterocyclic carbene ligands has been described. The carbenes were generated by synthesis of the silver( I) complexes from the imidazolium salts, followed by transmetallation of the C-N ligands to obtain the target electron-rich zerovalent palladium compounds. The bidentate coordination behaviour of the ligands was confirmed by H-1, C-13 NMR and X-ray spectroscopy. The complexes are active precatalysts for the selective transfer semihydrogenation of alkynes to Z-alkenes, with selectivities up to 99%. Copyright (C) 2011 John Wiley & Sons, Ltd.
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