[C:1]([O:4][CH:5]([CH3:25])[CH:6]=[CH:7][C:8]1[CH:13]=[CH:12][C:11]([C:14]2[CH:19]=[CH:18][C:17]([O:20][Si:21]([CH3:24])([CH3:23])[CH3:22])=[CH:16][N:15]=2)=[CH:10][CH:9]=1)(=[O:3])[CH3:2]>[Pd].O1CCCC1>[C:1]([O:4][CH:5]([CH3:25])[CH2:6][CH2:7][C:8]1[CH:13]=[CH:12][C:11]([C:14]2[CH:19]=[CH:18][C:17]([O:20][Si:21]([CH3:24])([CH3:22])[CH3:23])=[CH:16][N:15]=2)=[CH:10][CH:9]=1)(=[O:3])[CH3:2]14 g of 2-[4-(3-acetoxy-1-butenyl)phenyl]-5-trimethylsilyloxy-pyridine, 2 g of palladium on active charcaol (10 wt. %) and 200 ml of tetrahydrofuran are hydrogenated in an analogous manner to Example 1(a) to give 12 g of 2-[4-(3-acetoxy-1-butyl)phenyl]-5-trimethylsilyloxy-pyridine.
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