Process for catalytically reducing nitroaromatic compounds

Details Process for catalytically reducing nitroaromatic compounds Process for catalytically reducing nitroaromatic compounds

C - Chemistry, Metallurgy

07

D

260/295, 260/601

C07D 213/73 (2006.01) C07C 209/36 (2006.01)

Patent

CA 1227800

"PROCESS FOR CATALYTICALLY REDUCING NITROAROMATIC COM- POUNDS " * * * * * * Abstract A process is herein described for catalytically red- ucing nitroaromatic compounds by displacement of hydrogen from carbon monoxide and water or from synthesis gas to nitroaromatic compounds, the catalytic reduction being catalyzed by complexes of rhodium, iridium, ruthenium and osmium; said process is characterized in that the CO+H20 system or the (CO+H2)+H20 system is caused to react with a nitroaromatic compound of formula : Ar-(N02)x (I) wherein Ar is an aryl or hetero-aryl group, also substitut ed by inert groups; x is an integer from 1 to 3, in the presence of a complex catalyst of formula : [M Chel (L)2 ]+X- (II) or of a catalyst composed by carbonyl compounds and chel- ants of formula: Mz (CO)y+ n Chel (III) whexein M = Rh, Ir, Ru, 0s; "Chel" is a bidentate or tridentate aromatic nitrogen chelating compound; "L" is a molecule of carbon monoxide or of an olefin or half a molecule of a diolefin;X- is an anion selected from Cl-, Br-, I-, PF6-, BF4-, B(C6H5)4-,CO3- and HCO3-; z, y are integers with n being an integer or a fractional number, at temperatures ranging from about 25°C to 250°C, at a carbon monoxide pressure between 1 and 150 atmospheres. The products obtained from the hydrogenation of the starting nitroaromatic compounds consist of aryl- amines in general and are utilized as intermediates for the organic syntheses in the field of fine chemicals. * * * * *

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