title: Electron ionization mass spectra of indolenines obtained using sector and ion trap mass spectrometers.
abstract: The electron impact (EI)-induced fragmentations of 18 indolenines were studied using both double-focusing and ion trap mass spectrometers. The compounds used in this study were synthesized to provide correlations of characteristic fragment ions with specific structural differences. In 2-hydroxyindolenines the hydroxy group was involved in a major fragmentation process by interacting with the ester side chain to generate an alpha,beta-unsaturated gamma-lactone structure, with concomitant loss of the corresponding alcohol. In contrast, loss of an alkyl radical, derived solely from the 2-alkoxy group, is a major primary decomposition process for 2-alkoxyindolenines. EI-MS analyses using sector and ion trap spectrometers resulted in similar fragmentation patterns.
authors.affiliation: Departamento de Química, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, México. smorales@cinvestav.mx
authors.forename: Martha S
authors.initials: MS
authors.lastname: Morales-Ríos
authors.forename: Luis
authors.initials: L
authors.lastname: Velasco
authors.forename: Nadia A
authors.initials: NA
authors.lastname: Pérez-Rojas
authors.forename: Pedro
authors.initials: P
authors.lastname: Joseph-Nathan