期刊
GREEN CHEMISTRY
卷 11, 期 10, 页码 1610-1617出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/b913055c
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资金
- Deutsche Forschungsgemeinschaft DFG [HE-95433-1]
- Elitenetzwerk Bayern
Bridged and unbridged N-heterocyclic carbene (NHC) ligands were metalated with [Ir(COD)Cl](2) to give iridium(I) mono-and biscarbene substituted catalysts [Ir(COD)NHC(Cl)] and [Ir(COD)(NHC)(2)][X] (X: I, PF6, BF4, CF3COO, OTf). The prepared NHC-complexes were tested in the C-H borylation reaction of aromatic carbons with bis(pinacolato) diboron (B(2)pin(2)) and pinacolborane (HBpin). The use of microwave technology in this study not only facilitates a time efficient screening of a wide range of influences such as ligand sigma-donor strength and structural motif as well as the effects of the complex counter ion, but also provides an energy efficient heating source. Catalyst 6(TFA), which features a chelating NHC ligand, proved to be most effective catalyst and further investigations with this complex in the borylation of mono-and disubstituted benzene derivatives exploring chemo-and regioselectivity were undertaken.
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