Process for the continuous preparation of...

Details Process for the continuous preparation of... Process for the continuous preparation of...

C - Chemistry, Metallurgy

07

D

C07D 211/12 (2006.01) C07D 295/023 (2006.01)

Patent

CA 2137747

The reduction of triacetonamine with hydrazine also succeeds continuously by reactive distillation if the hydrazone is first formed and this is continuously transported to the distillation bottoms comprising a high-boiling solvent and an alkali at the base of a distillation column and the resulting 2,2,6,6-tetra-methylpiperidine is distilled off as an azeotrope. In this procedure a hydrazine/triacetonamine ratio of 1.5:1 to 2.0:1 is sufficient, in comparison with the conventional synthesis, the product yield being able to be considerably increased (>90 %). Moreover, the amounts of alkali and solvent used can be considerably reduced.

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