Summary
Nicotinic acid and 1H-benzotriazole appreciably resolved all the xylidine (dimethylaniline) isomers, while benzimidazole, nicotinamide and phthalimide can also separate all the isomers except 2,4- and 2,3-xylidines. The analyses were carried out on supports which were not treated with an alkali.
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Ono, A. Separation of xylidine isomers on heteroaromatic compounds by gas-liquid chromatography. Chromatographia 14, 39–40 (1981). https://doi.org/10.1007/BF02262060
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DOI: https://doi.org/10.1007/BF02262060