CATALYTIC REDUCTION FOR NITROAROMATIC COMPOUND

Japanese Patent JPS5931737

A

A process is herein described for catalytically reducing 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 being characterized in that the CO + H₂0 system or the (CO + H₂) + H₂0 system is caused to react with a nitroaromatic compound of formula:wherein:Ar is an aryl or hetero-aryl group, possibly substituted by inert groups;x is an integer from 1 to 3, in the presence of a complex catalyst of formula:or of a catalyst composed by carbonyl compounds and chelants of formula:wherein:M = Rh, lr, Ru, Os;"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 among Cl^-, Br^-, 1^-, PF₆^-, BR₄^-, B(C₆H₅)₄^-, CO₃^-- and HC03-;z, y are integers with n being an integer or a fractional number, at temperatures ranging from about 25°C to 250°C, at carbon monoxide pressure between 1 and 150 atmospheres.The products obtained from the hydrogenation of the starting nitroaromatic compounds consist of arylamines in general and are utilized as intermediates for organic syntheses in the pure chemicals field.

JIYOBANNI MESUTORONI
GURATSUIA TSUASHINOBIKU
ENTSUO ARESHIO

JP10946883A

February 20, 1984

June 20, 1983

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MONTEDISON SPA

B01J31/00; C07B61/00; C07C67/00; C07C209/00; C07C209/36; C07C211/46; C07C211/47; C07D213/18; C07C211/51; C07C211/52; C07D213/22; C07D471/04; (IPC1-7): B01J31/20; B01J31/22; C07C85/11; C07C87/50; C07D213/18; C07D213/22; C07D471/04

Motohiro Kurauchi

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