An abnormal or mesoionic N-heterocyclic carbene (NHC), namely 1,4-diphenyl-3-methyl-1,2,3-triazol-5-ylidene (Tz), formed from 1,4-diphenyl-3-methyl-1,2,3triazolium iodide and silver oxide, gave the corresponding silver carbene complex. The transmetalation reaction of the silver carbene complex with PdCl 2 (CH 3 CN) 2 gave a trans mononuclear complex, [(Tz) 2 PdCl 2 ]. Reaction of the silver carbene complex with Pd(OAc) 2 gave an acetate-bridged binuclear complex in which the palladium had undergone a C-H insertion at the ortho position of the phenyl group attached to the triazole nitrogen (1-position). The structures of these two complexes were established by single-crystal XRD data and spectroscopic data. The acetate complex was used as a catalyst for the stereoselective hydroarylation of alkynes.
Phosphorus-doped activated carbon from unexplored biomass was prepared, and it exhibits excellent electrochemical properties for green energy technology.
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