Mass-Spectra of Substituted N-Alkylpyrroles and Related-Compounds
Journal
Journal of the Chinese Chemical Society
Journal Volume
41
Journal Issue
1
Pages
27-31
Date Issued
1994
Author(s)
Lin, St
Shiue, Gy
Kuo, Yh
Shih, Ks
Abstract
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, ‐CH 2 COOMe, 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.
Type
journal article