Journal
ORGANOMETALLICS
Volume 29, Issue 14, Pages 3109-3116Publisher
AMER CHEMICAL SOC
DOI: 10.1021/om100435x
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New heterobidentate N-heterocyclic carbene-triazolyl ligands and several of their palladium(l I) complexes have been synthesized in a modular fashion using click chemistry. These complexes are the first examples where triazolyl-substituted NHCs exhibit bidentate behavior, which was confirmed by NMR. and X-ray diffraction studies. The synthesis of the complexes could be achieved in relatively few steps by introducing the diversity at a late stage in the synthesis. The complexes are active precatalysts in the transfer semihydrogenation of alkynes to Z-alkenes, with activity and selectivity depending on the triazolyl substituent and the NHC nitrogen substituent. Selectivities as high as 99% were observed.
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