[C:1]([C:3]1([OH:21])[CH2:8][CH2:7][N:6]([CH3:9])[CH:5]([CH2:10][C:11]2[CH:16]=[CH:15][C:14]([O:17][CH3:18])=[CH:13][CH:12]=2)[C:4]1([CH3:20])[CH3:19])#[CH:2]>CO.[Pd]>[CH2:1]([C:3]1([OH:21])[CH2:8][CH2:7][N:6]([CH3:9])[CH:5]([CH2:10][C:11]2[CH:12]=[CH:13][C:14]([O:17][CH3:18])=[CH:15][CH:16]=2)[C:4]1([CH3:20])[CH3:19])[CH3:2]A solution of 56 g of 4-ethinyl-2-(p-methoxybenzyl)-1,3,3-trimethyl-4-piperidinol in 350 ml of methanol is subjected to hydrogenation at atmospheric pressure and room temperature, the catalyst being 5% palladium on charcoal (5 g.).
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