Process for preparing 2,2,6,6-tetramethyl-4-piperidylamines

Details Process for preparing 2,2,6,6-tetramethyl-4-piperidylamines Process for preparing 2,2,6,6-tetramethyl-4-piperidylamines

C - Chemistry, Metallurgy

07

D

C07D 211/58 (2006.01) C07D 401/14 (2006.01)

Patent

CA 2060546

Two-stage process for preparing 2,2,6,6-tetramethyl-4-piperidylamines of the formula (I) (see formula I) in which R1 and R3 are hydrogen or methyl and R2 is e.g. C2-C12alkylene, which comprises (1) reacting 2,2,6,6-tetramethyl-4-piperidone with a mixture of (a) 80-100 % by weight of a compound of the formula (III) (see formula II) in which R1, R2 and R3 are as defined above, and (b) 0-20 % by weight of water in the absence of a solvent at a temperature of 50-100°C, with simultaneously separating off the water of reaction and the component (b) by distillation at 1.3-180 mbar, and (2) reacting the product obtained in the first stage with hydrogen in the presence of 0.001 to 0.04 % by weight of platinum or palladium or in the presence of 0.1 to 30 % by weight of Raney nickel, relative to the weight of the 2,2,6,6-tetramethyl-4- piperidone used in the first stage. The compounds of the formula (I) are of considerable industrial interest, since they can be used for preparing light stabilisers for synthetic polymers.

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