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Chemical ionization mass spectrometry using ammonia reagent gas. Selective protonation of conjugated ketones
Author(s) -
Dzidic I.,
McCloskey James A.
Publication year - 1972
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.1210060815
Subject(s) - reagent , protonation , chemistry , chemical ionization , mass spectrometry , conjugated system , ammonia , proton affinity , ion , atmospheric pressure chemical ionization , inorganic chemistry , ionization , organic chemistry , chromatography , polymer
Studies using ammonia as a selective reagent gas in chemical ionization mass spectrometry were extended to conjugated ketones. Their proton affinities were in the range of most nitrogen‐containing compounds (> 207 ± 3 kcal/mole), thereby permitting proton transfer from [NH 4 ] + ‐, leading to well stabilized protonated molecular ions as the most abundant ion products.