Unusual neutral and radical losses in 2′‐substituted N‐phenylanthranilic acids on electron impact

Unusual expulsions of [H 2 O+CO 2 ] from the M +. of N-(o-carboxyphenyl)anthranilic acid, [H 2 O+CH 2 O] from the M +. of N-(o-methoxyphenyl)anthranilic acid and [H 2 O+ . NO 2 ] from the M +. of N-(o-nitrophenyl) anthranilic acid were observed under electron impact conditions. These processes are stepwise in the corresponding para-substituted N-phenylanthranilic acids. The proposed fragmentation pathways and their mechanisms are supported by B/E linked-scan spectra, collision-activated decomposition (CAD)-mass-analysed ion kinetic energy (MIKE) spectra, high-resolution data, deuterium labelling and chemical substitution