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Mass Spectra of Substituted N-Alkylpyrroles and Related Compounds
Authors:Shaw-Tao Lin  Gong-Yih Shiue  Yueh-Hsiung Kuo  Kae-Shyang Shih
Abstract:Under El conditions, substituents on N-alkylpyrroles affect fragmentation of the alkyl groups. The electron-withdrawing character of the cyano group retarded formation of a N-methylene cation, and a labile substituent, i.e., -CHO, -CH2COOMe, competed with an N-alkyl group to be a initial fragmentation center, MNDO calculation of the heat of formation of possible fragment ions showed that protonated pyridine is the most stable among the isobaric ions.
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