COC1C=CC(C[O:8][CH2:9][C:10]2[N:14]3[C:15]4[CH:29]=[CH:28][C:27]([Cl:30])=[CH:26][C:16]=4[C:17]([C:20]4[CH:25]=[CH:24][CH:23]=[CH:22][CH:21]=4)=[N:18][CH2:19][C:13]3=[N:12][N:11]=2)=CC=1.Br.[OH-].[Na+]>C(O)(=O)C>[C:20]1([C:17]2[C:16]3[CH:26]=[C:27]([Cl:30])[CH:28]=[CH:29][C:15]=3[N:14]3[C:10]([CH2:9][OH:8])=[N:11][N:12]=[C:13]3[CH2:19][N:18]=2)[CH:21]=[CH:22][CH:23]=[CH:24][CH:25]=1To a solution of 3,0 g 1-[(p-methoxybenzyloxy)-methyl]-6-phenyl-8-chloro-4H-s-triazolo[4,3-a][1,4]benzodiazepine in 30 ml of glacial acetic acid is added at 25° 24 ml 48% aqueous hydrobromic acid. The reaction mixture is stirred for 20 minutes, neutralised with 30% sodium hydroxide solution and extracted with methylenechloride. The organic phase is separated, washed with water, dried over sodium sulphate and evaporated to dryness. The crystallisation of the residue from acetate-ether-petrol ether yields 6-phenyl-8-chloro-4-H-s-triazolo[4,3-a][1,4]benzodiazepine-1-methanol, M.P. 209°-211°.
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