Abstract
We present herein the synthesis and characterization of two ruthenium(II) half-sandwich complexes (1·PF6 and 2·PF6) featuring phosphine-free ligands N-(pyridin-2-yl)quinolin-2-amine (L-1) and N-(4-methylpyridin-2-yl)quinolin-2-amine (L-1). The molecular structures of both complexes were determined by single-crystal X-ray diffraction. These complexes functioned as excellent phosphine-free catalytic systems for the synthesis of aryl amines from corresponding nitroarenes by employing sodium borohydride under mild conditions in ethanol. Intermediacy of [Ru–H] has been established by spectroscopic studies. The reduction showed good chemo selectivity in presence of −COOH and –NHCOMe functionality.
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