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Ion chemistry of phthalamic acids. 2—mass spectral retrosynthesis of phthalanilic acids and structure analysis of [C 8 H 6 NO 2 ] + ions from N ‐cyclohexylphthalamic acid and [MH] + of N ‐cyclohexylphthalimide
Author(s) -
Selva Antonio,
Traldi Pietro,
Ventura Paolo,
Servadio Vittorino
Publication year - 1983
Publication title -
organic mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.475
H-Index - 121
eISSN - 1096-9888
pISSN - 0030-493X
DOI - 10.1002/oms.1210180703
Subject(s) - phthalimide , chemistry , electron ionization , ion , phthalimides , mass spectrum , amine gas treating , retrosynthetic analysis , mass spectrometry , kinetic energy , polyatomic ion , ionization , computational chemistry , organic chemistry , chromatography , total synthesis , physics , quantum mechanics
Under electron impact o ‐phthalanilic acids show the retrosynthetic reaction previously described for other phthalamic acids. As primary amine derivatives they undergo thermal and electron impact induced water loss. Like the molecular ions of the related phthalimides, their [MH 2 O] +˙ do not give [C 8 H 6 NO 2 ] + fragments, which are obtained from the N ‐cyclohexyl derivative. The structure of such fragments is investigated by collisionally activated mass analysed ion kinetic energy spectra, and compared with the [MH] + of phthalimide, obtained by chemical ionization with CH 4 or NH 3 and assumed to be possible models.