Premium
Ammonium adduct ion in ammonia chemical ionization mass spectrometry: 2—Mechanism of elimination of neutrals from the ammonium adduct ion
Author(s) -
Nakata Hisao,
Hoshino Yoshihiko,
Takeda Naohito,
Tatematsu Akira
Publication year - 1985
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.1210200708
Subject(s) - adduct , chemistry , ion , ammonia , ammonium , mass spectrometry , metastability , decomposition , ether , chemical ionization , inorganic chemistry , reaction mechanism , mass spectrum , ionization , ion source , photochemistry , organic chemistry , catalysis , chromatography
The mechanism of elimination of ROH (R = H or CH 3 ) from the ammonium adduct ion, [M+NH 4 ] + , of 1‐adamantanol and its methyl ether is examined by using linked‐scan metastable ion spectra and by measuring the dependence of the peak intensity ratio [M+NH 4 ] + /[M+NH 4 ROH] + on ammonia pressure. For 1‐adamantanol both S N i and S N 1 reactions are suggested in metastable ion decomposition, while only the S N 1 mechanism is operative in the ion source. For 1‐adamantanol methyl ether the S N 1 reaction predominates both in metastable ion decomposition and in the ion source reaction.