Synthesis, Characterization and Application of NNN Pincer Manganese Complexes with Pyrazole Framework in α-Alkylation Reaction.

A series of novel NNN pincer manganese complexes based on pyrazole skeleton were efficiently synthesized in a two-step process. All of the new complexes were fully characterized by H, C NMR spectra. Furthermore, the molecular structures of complexes and were also determined by X-ray single-crystal diffraction. The manganese(I) catalysts obtained showed efficient catalytic activity in the α-alkylation reaction of ketones with alcohols. Under optimal reaction conditions, the expected products were procured with moderate to high yields.