Preparation of mono(dimethylglyoxime)(triphenylphosphine)‐halogenocobalt(I) complexes and their application as homogeneous catalysts in reduction of aromatic nitrocompounds

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Abstract
The complexes [Co(I)(DMGH)(PPh3)X].C2H5OH (XCl/Br) have been prepared and characterised by elemental analysis, infrared and electronic spectral studies and magnetic measurements. These compounds have been used as homogeneous catalysts for the reduction of nitrobenzene at atmospheric and higher pressures. From a study of various operational parameters, it has been observed that the reduction at atmospheric pressure was only possible in a basic ethanolic medium and resulted in 64% of azobenzene on input nitrobenzene basis whereas at higher pressure (4.2 × 103 kN/m2), 60% of aniline on the same basis could be obtained in neutral ethanolic medium. The optimum conditions were established both under normal pressure and under high pressure.