Reactions of 2and 4-Vinylpyridines 24G1The pure product gave no depression of melting point when mixed with Compound A. 2-Amino-5-chlorobenzitnidazole is therefore the correct representation of the structure of the monochlorination product of 2-aminobenzimidazole and of the condensation product of ^-chloro-ophenylenediamine with cyanogen bromide.2 -Amino -5 -chloro -1 -(-nitrob enzenesulf onyl) -benzimidazole (VII).-2-Amino-5-chlorobenzimidazole (28.5 g., 0.170 mole) and m-nitrobenzenesulfonyl chloride (39.0 g., 0.175 mole) were shaken overnight in 70 ml. of dry pyridine. The pasty mass was poured into 400 ml. of water, and 51.1 g. of yellow, alkali-insoluble solid was isolated following cooling, filtration and drying. The material was recnzstallized from ethanol and methyl cellosolve repeatedly, with great loss. After seven recrystallizations, the platelets melted at 216-218°.
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