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Temperature effect on the single and double hydrogen atom transfer reactions in o ‐, m‐and p ‐toluic acid butyl esters
Author(s) -
Tajima Susumu,
Yanagisawa Tamae,
Azami Tadashige,
Tsuchiya Toshikazu
Publication year - 1980
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.1210151204
Subject(s) - hydrogen atom , chemistry , hydrogen , ion , atom (system on chip) , ionization , reaction rate constant , analytical chemistry (journal) , medicinal chemistry , kinetics , organic chemistry , group (periodic table) , physics , quantum mechanics , computer science , embedded system
The temperature effect on the single and double hydrogen atom transfer reactions in o ‐, m‐ and p ‐toluic acid n ‐butyl esters and isobutyl esters has been investigated. For the meta and para isomers, the abundance of the m / z 137 ion [C 8 H 9 O 2 ] + generated by a double hydrogen atom transfer reaction increases relative to the m / z 136 ion [C 8 H 8 O 2 ] + ˙ generated by a single hydrogen atom transfer reaction upon lowering the temperature of the ionization chamber. On the other hand, the ratio of the peak abundances [137] + /[136] + for the ortho isomers is nearly constant when the temperature is changed. It is shown that this is due to the difference between the appearance energies of the m / z 136 and m / z 137 ions.