Japanese Patent JPH0251420

B2

The present invention describes a process for the catalytic reduction of nitro-aromatic compounds by transfer of hydrogen from alcohols to nitro-aromatic compounds, said reduction being catalyzed by iridium complexes and characterized in that a primary or secondary alcohol having the formula (I) or a glycol: is made to react with a nitro-aromatic compound having the formula (II): Ar-(NOy)x (II) wherein; R and R min , possibly linked to each other according to homo- or heterocycles, represent indifferently either a hydrogen atom or a possibly substituted hydrocarbylic group having up to 30 carbon atoms; Ar represents an aryl or hetero-aryl group, also substituted with inert groups; x and y, either equal to or different from each other, represent an integer chosen from 1 and 2, in the presence of a complex catalyst of iridium chosen from among those having formulae (III) and (IV); {Ir Chel (L-L)}X (III) and Ir Chel (L)2Y (IV) wherein; Chel represents a kelating bi-toothed nitrogeneous compound; L-L represents a molecule of a diolefine, preferably not conjugated; L represents a mono-olefine molecule; X<-> represents an anion chosen from among: Cl<->, Br<->, I<->, PF6<->, BR4<->, ClO4<->, B(C6H5)4<->, OH<->, wherein R and R min have the significance already given to them; Y is a halogen, preferably Cl, Br or I; and optionally with a compound chosen from mineral alkaline compounds, at a temperature comprised between about 20 DEG C and the boiling temperature of the reaction mass. The compounds thus obtained consist of the derivatives of the partial or total hydrogenation of the nitro-aromatic starting compounds constituted by anilines or aryl-amines in general, by the aryl-hydroxyl-amines, by the aryl-hydrazo compounds and by the aryl-azo compounds, and can be used as intermediates for organic syntheses in general, in the field of fine chemistry.

JPS59101430

MANUFACTURE OF ACETIC ACID, PROPIONIC ACID AND THEIR ESTERS

JOBANNI MESUTORONI
GURATSUIA TSUASHINOBIKU
ANNAMARIA KAMUSU
KURORINDA DERU BIANKO

JP6105683A

November 07, 1990

April 08, 1983

Click for automatic bibliography generation  

MONTEDISON SPA

B01J31/00; C07B61/00; B01J31/18; B01J31/22; C07C67/00; C07C201/00; C07C207/02; C07C209/00; C07C209/32; C07C209/36; C07C211/46; C07C211/47; C07C211/51; C07C211/58; C07C213/00; C07C213/02; C07C217/84; C07C239/00; C07C241/00; C07C243/22; C07C291/08

Next Patent: YBA2CU3O7-XSEY SUPERCONDUCTOR