Method of preparing 1-amino-2, 6-dimethylpiperidine
AssigneeCassella Aktiengesellschaft
InventorsWolfgang Rybczynski, Wolfgang Bauer, Eckard Kujath, Manfred Schrod
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Abstract
The present invention relates to improved processes for the preparation of 1-amino-2,6-dimethylpiperidine whereby the yield is more than 90%. The processes involve the hydrogenation of 1-nitroso-2,6-dimethylpiperidine in the presence of a palladium catalyst which is partly poisoned with iron ions, in an aqueous solvent, and are characterized by the inclusion of at least one surfactant. The surfactant preferably is anionic or nonionic.
Claims13
In the process for the preparation of 1-amino-2,6-dimethylpiperidine by catalytic hydrogenation of 1-nitroso-2,6-dimethylpiperidine in the presence of a palladium catalyst partly poisoned with iron ions, the improvement which comprises increasing the yield to more than about 90% by carrying out the hydrogenation in an aqueous solvent containing from about 0.1 to 10% by weight of at least one surfactant.
Dependencies are inferred from the claim text.