Abstract
The unsymmetrical, achiral and chiral NCN pincer ligand precursors ( 3a-3d) with oxazoline and pyrazole as N donors as well as ( 3e) which has oxazolinyl and amino group have been synthesized in a facile manner in four steps starting from commercially available isophthalaldehyde. Direct C2 metallation of the precursors ( 3a–3e) with Pd(OAc) 2 in refluxing HOAc, followed by treatment with LiCl at room temperature provided convenient access to the corresponding pincer palladium(II) complexes ( 4a–4e). The molecular structure of complex 4e has been determined by X-ray single-crystal diffraction. The obtained Pd complexes exhibited good activities in the Suzuki reactions of aryl bromides and activated aryl chlorides with phenylboronic acid.
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