Title:Bimetallic Cis-dioxido-molybdenum(VI) Complex Containing Multidentate Hydrazone Ligand Catalyzed the Oxidation of Alcohols in Biphasic Medium
VOLUME: 4 ISSUE: 3
Author(s):Sunshine D. Kurbah, Mrityunjaya Asthana, Ibanphylla Syiemlieh and Ram A. Lal *
Affiliation:Centre for Advanced Studies, Department of Chemistry, North-Eastern Hill University, Shillong-793022, Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati-781039, Centre for Advanced Studies, Department of Chemistry, North-Eastern Hill University, Shillong-793022, Centre for Advanced Studies, Department of Chemistry, North-Eastern Hill University, Shillong-793022
Keywords:Alcohols, bimetallic, biphasic, carbonyl compounds, H2O2, NMR spectroscopy, oxidation.
Abstract:Background: Carbonyl compounds are one of the most important starting materials used in
pharmaceutical and industries. Due to their high demand, a vast number of efficient and aerobic oxidation
methods have been developed using suitable oxidizing agents or catalyst. Using cheaper starting
materials and efficient methods which are more favorable are very important in terms of economic and
environmental view point. The present synthetic protocol involved the oxidation of alcohols catalyzed
by bimetallic molybdenum(VI) complex containing multidentate hydrazone ligand.
Methods: Benzylic, allylic, propargylic, and aliphatic alcohols were oxidized using bimetallic molybdenum(
VI) complex in aqueous medium using 15% hydrogen peroxide as a mild oxidizing agent. The
products were confirmed using 1H and 13C NMR spectroscopy.
Results: We have oxidized different varieties of alcohols including primary benzylic, allylic, propargylic
and aliphatic alcohols to their corresponding aldehyde using our synthesized bimetallic complex.
The process went smoothly and moreover the catalyst could be recovered with almost the same
amount of product formation in the next catalytic cycles. Benzyl alcohols containing electron donating
groups give high yield compared to benzyl alcohol containing electron withdrawing groups.
Conclusion: The bimetallic cis-dioxido-molybdenum(VI) complex containing multidentate hydrazone
ligand, catalyzed the oxidation of primary benzylic, allylic, propargylic and aliphatic alcohols. The
process went smoothly and moreover the complex can be easily recovered without any decrease in
percentage yield in the next cycles.
