[CH2:1]([N:3]1[CH2:8][CH2:7][CH:6]([CH:9]2[CH2:14][CH2:13][N:12](C(OCC3C=CC=CC=3)=O)[CH2:11][CH2:10]2)[CH2:5][CH2:4]1)[CH3:2].O.C(O)(=O)C.[H][H]>CO.[Pd]>[CH2:1]([N:3]1[CH2:4][CH2:5][CH:6]([CH:9]2[CH2:14][CH2:13][NH:12][CH2:11][CH2:10]2)[CH2:7][CH2:8]1)[CH3:2]A solution of 7.6 g (0.023 mol) of 1-ethyl-4-[1-(phenylmethoxycarbonyl)-4-piperidinyl]piperidine in a mixture of 70 ml of methanol, 30 ml of water and 10 ml of glacial acetic acid was hydrogenated in the presence of 10% palladium/charcoal at room temperature and 3 bar of hydrogen pressure until the uptake of hydrogen had ceased. After working up in the usual way the desired compound was obtained as a colourless oil in a quantitative yield.
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