[O:1]=[C:2]1[NH:6][CH2:5][CH2:4][N:3]1[C:7]1[CH:8]=[C:9]([CH:12]=[CH:13][CH:14]=1)[C:10]#[N:11].[ClH:15]>CO.[Pd]>[ClH:15].[NH2:11][CH2:10][C:9]1[CH:8]=[C:7]([N:3]2[CH2:4][CH2:5][NH:6][C:2]2=[O:1])[CH:14]=[CH:13][CH:12]=140.00 g (210 mmol) 3-(2-oxo-imidazolidin-1-yl)-benzonitrile are suspended in 1500 ml of methanol, 53 ml of 37% hydrochloric acid are added. The mixture is hydrogenated for 20 hours at ambient temperature under a pressure of 7 bar with 4.00 g palladium/charcoal. The catalyst is filtered off, the filtrate is concentrated and the precipitate formed is suction filtered, washed with acetone and dried.
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