Process for the preparation of c-substituted pyridines...

Details Process for the preparation of c-substituted pyridines... Process for the preparation of c-substituted pyridines...

C - Chemistry, Metallurgy

07

D

260/292, 260/281

C07D 211/12 (2006.01) C01B 3/58 (2006.01) C07D 213/08 (2006.01) C07D 213/09 (2006.01) C07D 215/04 (2006.01) C07D 295/027 (2006.01)

Patent

CA 1129423

Abstract of the Disclosure An improved process for the preparation of pyridines and/or hydrogenated pyridines that have been substituted with a hydrocarbon group at one or more carbon atoms. .gamma.-cyanoketone, in a gaseous phase and in the presence of hydrogen, is passed in a reaction zone over a first catalyst containing a catalytically active metal or compound of a metal selected from the group copper, silver, gold, iron, nickel, cobalt, ruthenium, rhodium, palladium, osmium, iridium and platinum to form a reaction mix- ture. A hydrogen-containing gas is separated from the reaction mixture, passed over a second catalyst containing a catalytically active metal or com- pound of a metal selected from the group iron, nickel and cobalt at a temperature of between 300 and 800°C, and the hydrogen-containing gas so treated is recycled to the reaction zone.

335854

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