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Synthesis, Structure, and Reactivity of Dicarbene Dipalladium Complexes
Author(s) -
Li Yunfei,
Yang Longguang,
Chen Qian,
Cao Changsheng,
Guan Pei,
Pang Guangsheng,
Shi Yanhui
Publication year - 2013
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.201200425
Subject(s) - imidazole , chemistry , linker , benzimidazole , stacking , palladium , alkyl , reactivity (psychology) , ethylene , crystallography , crystal structure , selectivity , stereochemistry , catalysis , organic chemistry , medicine , alternative medicine , pathology , computer science , operating system
A series of imidazole‐based and benzimidazole‐based di‐NHC dipalladium complexes with alkyl bridges of different chain lengths were prepared. All complexes were fully characterized by NMR spectroscopy and elemental analyses. The crystal structures of three complexes were determined by X‐ray diffraction. X‐ray studies show the length of linker effects the solid structure of these complexes and π–π stacking plays an important role for the configuration of NHC‐Pd‐Py subunits. The activity of NHC‐palladium complexes was investigated in the mono‐ and double‐Heck reactions, and the imidazole‐based palladium complex bearing the shortest ethylene bridge shows the best activity and selectivity in both reactions.