Homogeneous catalysis of the reduction of nitrobenzene by bromotris(triphenylphosphine) copper (I)
- 1 January 1979
- journal article
- research article
- Published by Wiley in Journal of Chemical Technology and Biotechnology
- Vol. 29 (2) , 88-99
- https://doi.org/10.1002/jctb.503290203
Abstract
Homogeneous reduction of nitrobenzene by hydrogen in presence of complex [CuIBr(PPh3)3] as catalyst has been investigated. From a study of various operational parameters, it has been observed that maximum reduction occurred at 2.5 × 103 kPa pressure and at 473–513 K and resulted in 75% aniline, 10% azobenzene, 2% nitrosobenzene in ethanol, and 70% aniline, 5% azobenzene, 7% nitrosobenzene in dimethylformamide, calculated on the basis of input nitrobenzene. In an attempt to elucidate the reduction mechanism two new intermediates, [CuHPPh3Br]2 (I) and [(C6H5N=NC6H5)Cu2(PPh3)4Br2] (II), have been isolated and characterised by elemental analysis, spectral, thermal, magnetic and p.m.r. studies.Keywords
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