Chemistry of carbon compounds – Miscellaneous organic carbon compounds – C-metal
Patent
1978-08-04
1980-04-08
Doll, John
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
C-metal
C07C 8508
Patent
active
041972600
ABSTRACT:
Aliphatic, linear, saturated or unsaturated .alpha.,.omega.-diamines, conning from 8 to 12 carbon atoms, are prepared from the corresponding .alpha.,.omega.-dialdehydes by firstly converting the dialdehyde to di-imine by reaction with ammonia at less than 25.degree. C. and preferably less than 5.degree. C. in a mixture of water and of an organic solvent, and subsequently subjecting the di-imine to reduction with hydrogen in the presence of a catalyst which under the reaction conditions is capable of reducing all the iminic double bonds while leaving any olefinic bonds unchanged. When olefinic bonds are present and it is desired to obtain a saturated diamine, the unsaturated diamine obtained as hereinbefore stated is subjected to hydrogenation in the presence of a catalyst chosen among palladium, platinum, ruthenium and rodium. Preferred catalysts for the reduction of the di-imine are finely subdivided nickel and cobalt.
REFERENCES:
patent: 1966478 (1934-07-01), Baur
patent: 2636051 (1953-04-01), Whetstone et al.
Augustine, "Catalytic Hydrogenation", pp. 57, 102 & 103 (1965).
De Gaetano Mario
Rossi Pietro P.
Siclari Francesco
Doll John
Snia Viscosa Societa' Nazionale Industria Applicazioni Viscosa S
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