Toluidine picrate

Toluidine Picrate. See in Vol 8, P284-R under o-Toluidine Picrate ... 

X 10 picric acid + x-molar p-toluidine picrate k = first-order velocity constant, s " ... 

Its nitrogen readily becomes pentavalent, forming quaternary ammonium salts. Some derivatives of known properties, useful for qualitative identification are the hydrochloride, white crystals melting at 272° with decomposition the nitrate, m.p. 184-185° the picrate, yellow rhombic prisms (from absolute alcohol) melting at 221-222° to a red oiB the />-toluidine, m.p. 150° and the anilide , m.p. 85°. Alkyl iodides readily react with it to form water-soluble compounds. The carboxylic group of nicotinic acid behaves typically, forming salts with alkalies, alkaline earth hydroxides or heavy metals the latter salts are quite insoluble and their preparation is useful to separate nicotinic acid from mixtures. 

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