Abstract:
Transition metal (Cu, Mn, Ni, Zr) substituted metal organic frameworks (MOFs) are prepared for the
reduction of carbon–carbon multiple bonds with hydrazine hydrate in ethanol under mild reaction conditions. Among the MOFs investigated in this study, the Cu framework substituted MOF exhibited the best
activity in this study. Further, Cu nanoparticles (CuNPs) are supported on the surface of a Cu framework
substituted MOF to achieve excellent reduction activity. The catalyst exhibits efficient recyclability with no
appreciable loss in the catalytic activity even after five recycles. In order to establish the reaction mechanism,
reactions are performed under N2 and Ar atmospheres. A reaction is also performed under an Ar atmosphere but in the presence of H2O2 to elucidate the mechanism. The catalyst exhibits excellent activity
in the reduction of alkynes. Under the optimum reaction conditions, the catalyst is also successful
in reducing a wide range of aldehydes and ketones. The present catalytic process demonstrates
several key advantages such as mild and convenient reaction conditions, a low substrate to hydrazine
ratio, reusability, and cost-effectiveness of the catalyst (Pt or Pd free catalyst).
