[NH2:1][C:2]1[CH:7]=[CH:6][N:5]=[C:4]([C:8]2[CH:13]=[CH:12][N:11]=[CH:10][CH:9]=2)[N:3]=1.O.[ClH:15]>C(O)(C)C>[NH2:1][C:2]1[CH:7]=[CH:6][N:5]=[C:4]([C:8]2[CH:13]=[CH:12][N:11]=[CH:10][CH:9]=2)[N:3]=1.[ClH:15].[ClH:15].[NH2:1][C:2]1[CH:7]=[CH:6][N:5]=[C:4]([C:8]2[CH:13]=[CH:12][N:11]=[CH:10][CH:9]=2)[N:3]=1The hydrochloride salt of 4-amino-2-(4-pyridinyl)-pyrimidine was prepared as follows: a mixture containing 10 g. of 4-amino-2-(4-pyridinyl)pyrimidine, 30 ml. of water and 20 ml. of concentrated hydrochloric acid was warmed to effect solution. To the warm solution was added isopropyl alcohol to turbidity (about 110 ml) whereuponcrystals started to separate. The mixture was cooled and the crystallized precipitate was collected, washed with isopropyl alcohol and ether and dried in vacuo at 80° C. to yield 9.5 of 4-amino-2-(4-pyridinyl)pyrimidine dihydrochloride as its monohydrate, m.p.229° C. with decomposition.
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