Process for the preparation of .alpha.,.zeta.diamines and products obtained therefrom
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United States of America Patent
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Apr 8, 1980
Issued Date -
N/A
app pub date -
Aug 4, 1978
filing date -
Oct 20, 1975
priority date (Note) -
Expired
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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.
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