[CH3:1][C:2]1([CH3:15])[CH2:7][C:6](=[N:8][CH2:9][C:10]([CH3:12])=[CH2:11])[CH2:5][C:4]([CH3:14])([CH3:13])[NH:3]1.CC([O-])(C)C.[K+].CS(C)=O>C1(C)C=CC=CC=1>[CH3:13][C:4]1([CH3:14])[CH2:5][C:6](=[N:8][CH:9]=[C:10]([CH3:12])[CH3:11])[CH2:7][C:2]([CH3:15])([CH3:1])[NH:3]1162.5 g of the N-(2,2,6,6-tetramethyl-4-piperidylidene)-2-methylallylamine are dissolved in 162 ml of toluene in a 500 ml three-necked flask with reflux condenser, and 4.86 g of potassium tert-butylate are added. To the reaction mixture are then added, with stirring, 50 ml of dimethyl sulfoxide, and stirring is maintained at 50° C. for 8 hours. The organic phase is afterwards extracted with 100 ml of distilled water, and the organic part, after separation of the solvent, is distilled to yield 136.9 g of N-(2,2,6,6-tetramethyl-4-piperidylidene)-2-methyl-1-amino-1-propene as a colourless liquid, b.p. 56° C. at 40 Pa (82% of theory).
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