Xylidine properties

Treon JF et al The toxic properties of xylidine and monomethylaniline. II. The comparative toxicity of xylidine (Cells [CH3]2NH2) and monomethylaniline (CeHsNHlCHs]) inhaled as vapor in air by animals. AMA Arch Ind Hyg Occup Med 1 506-524, 1950... 

Treon JF, Deichman WB, Sigmon HE, et ah The toxic properties of xylidine and monomethylaniline. I. The comparative toxicity of xylidine and monomethylaniline when administered orally or intravenously to animals or applied on their skin. J Ind Hyg Toxicol 31 1-20, 1949... 

Aniline does not give water-stable salts with weak acids like acetic acid. Some aromatic amines do give crystalline acetates with acetic acid, but these are decomposed by water with separation of the free base. This property is utilized industrially in the isolation of m-xylidine from a mixture containing its isomers. Hence, free aniline separates out of an aqueous solution of an aniline salt with a mineral acid if the mineral acid anion is replaced by the acetate ion, for example, by the addition of sodium acetate in sufficient concentration. 

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