Mass spectral fragmentation pathways in aminonitrobenzenes. A mass spectrometry/mass spectrometry collision-induced dissociation study

✍ Scribed by Jehuda Yinon

• Publisher: John Wiley and Sons
• Year: 1990
• Tongue: English
• Weight: 366 KB
• Volume: 25
• Category: Article
• ISSN: 1076-5174
• DOI: 10.1002/oms.1210251107

✦ Synopsis

Abstract

A collision‐induced dissociation (CID) study of a series of aminonitrobenzenes was carried out using a tandem BB mass spectrometer. Fragmentation pathways were determined in the electron impact mode. Loss of NO^·^ was found to be a major decomposition process. Peaks formed by this process were ‘dished’ in compounds having a nitro group para or ortho to an amino group and Gaussian peaks for compounds having a nitro group meta to an amino group. This loss of NO^·^ with formation of dished peaks occurred for both unimolecular and collision‐induced dissociation pointing to a similar process for both modes of dissociation involving large kinetic energy release.

Loss of OH^·^, due to an ortho effect, was a major decomposition route only in a compound having two nitro groups ortho to the amino group, whilst in other compounds where a nitro group was ortho to an amine this process was smaller because of competitive decomposition processes.

Loss of NO~2~^·^ was a major decomposition route in most compounds and it preceded the cleavage of the aromatic ring.