[C:1]1([N:7]2[CH2:12][CH2:11][N:10]([CH2:13][CH2:14][CH:15]=[CH:16][C:17]3[CH:18]=[C:19]4[C:24](=[CH:25][CH:26]=3)[NH:23][C:22](=[O:27])[CH:21]=[CH:20]4)[CH2:9][CH2:8]2)[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1>C(O)C.[Pd]>[C:1]1([N:7]2[CH2:12][CH2:11][N:10]([CH2:13][CH2:14][CH2:15][CH2:16][C:17]3[CH:18]=[C:19]4[C:24](=[CH:25][CH:26]=3)[NH:23][C:22](=[O:27])[CH:21]=[CH:20]4)[CH2:9][CH2:8]2)[CH:2]=[CH:3][CH:4]=[CH:5][CH:6]=11.5 Grams of 6-[4-(4-phenyl-1-piperazinyl)-1-butenyl]-carbostyril and 0.3 g of 10%-palladium were dispersed in 120 ml of ethanol and catalytically reduced for 6 hours. The reaction mixture was filtered and the mother liquor was concentrated under a reduced pressure and the residue thus obtained was recrystallized from ethanol and 0.8 g of 6-[4-(4-phenyl-1-piperazinyl)butyl]carbostyril was obtained in colorless needle-like crystals. Melting point: 159°-162° C.
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