The reaction of an aromatic heterocycle with a proton is called a protonation. One of articles about this theory is 《Effect of structure on the separation of 2- and 3-alkylpyrroles by gas chromatography》. Authors are Bean, Gerritt P..The article about the compound:3-Methyl-1H-pyrrolecas:616-43-3,SMILESS:CC1=CNC=C1).Reference of 3-Methyl-1H-pyrrole. Through the article, more information about this compound (cas:616-43-3) is conveyed.
The Cu columns were 2- and 5-m. lengths of 0.25 in. inside diameter packed with Tide mesh size 40-80. Flow rate of He was 50ml. min. The temperature of the column was 150°. The ethylpyrroles were completely separated on the 5-m. Tide column and the other alkylpyrroles were separated on the 2-m. column, however 2- and 3-methylpyrroles are not separated The retention time of 2,5-dimethylpyrrole is slightly shorter and the retention time of the 2,4-dimethylpyrrole is longer than that of 2-ethylpyrrole.
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Reference:
Synthesis and Crystal Structure of a Chiral C3-Symmetric Oxygen Tripodal Ligand and Its Applications to Asymmetric Catalysis,
Chiral lanthanide(III) complexes of sulphur–nitrogen–oxygen ligand derived from aminothiourea and sodium D-camphor-β-sulfonate