[Cl:1][C:2]1[CH:7]=[C:6]([N+:8]([O-])=O)[CH:5]=[C:4]([Cl:11])[C:3]=1[CH:12]([C:15]1[CH:20]=[CH:19][C:18]([Cl:21])=[CH:17][CH:16]=1)[C:13]#[N:14].S1C=CC=C1.[H][H]>CO.[Pt]>[NH2:8][C:6]1[CH:5]=[C:4]([Cl:11])[C:3]([CH:12]([C:15]2[CH:20]=[CH:19][C:18]([Cl:21])=[CH:17][CH:16]=2)[C:13]#[N:14])=[C:2]([Cl:1])[CH:7]=1A mixture of 31.1 parts of 2,6-dichloro-α-(4-chlorophenyl)-4-nitrobenzeneacetonitrile (intermediate 1), 2 parts of a solution of 4% thiophene in methanol and 480 parts of methanol is hydrogenated in the Parr apparatus at 50 degrees C with 3 parts of 5% platinum-on-charcoal catalyst. After the calculated amount of hydrogen is taken up, the catalyst is filtered off, washed with tetrahydrofuran and the filtrate is evaporated in vacuo. The residue is crystallized from 160 parts of 2-propanol. The product is filtered off, washed with 2,2'-oxybispropane and dried, yielding 4-amino-2,6-dichloro-α-(4-chlorophenyl)benzeneacetonitrile. (intermediate 2).
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