Summary
Nicotinic acid, picolinic acid, isonicotinic acid, histidine and other amphoteric heteroaromatic compounds, uracil, thymine, isatin and other heteroaromatic compounds having imino and carbonyl groups as well as IH-benzotriazole, benzoguanamine and guanidine phosphate effectively resolved all the xylidine (dimethylaniline) isomers. Furthermore, the mixed phases of nicotinamide + p-amino-benzoic acid and melamine+barbituric acid also provided an appreciable resolution. These analyses were carried out using a support which were not treated with an alkali.
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Ono, A. Gas chromatographic analysis of xylidine isomers on heteroaromatic compounds. Chromatographia 14, 692–694 (1981). https://doi.org/10.1007/BF02259456
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DOI: https://doi.org/10.1007/BF02259456