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The ‘preference factor’ and isotope effect in the loss of hydrogen or deuterium from labeled toluenes
Author(s) -
Bey J. H.,
Corn J. E.,
Baitinger W. E.,
Caprioli R. M.,
Benkeser R. A.
Publication year - 1970
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.1210031105
Subject(s) - deuterium , hydrogen , toluene , kinetic isotope effect , chemistry , hydrogen atom , ion , isotope , mass spectrometry , analytical chemistry (journal) , atomic physics , physics , nuclear physics , organic chemistry , alkyl , chromatography
Metastable ion decompositions involving the loss of hydrogen and deuterium from partially deuterated toluene ions were studied using a double focusing mass spectrometer. The electric sector voltage was adjusted so that the only ions transmitted were those which lost a particular fraction of their kinetic energy in decompositions taking place in front of the electric sector. Transitions involving loss of mass 1 or mass 2 from the molecular ions of toluene‐α‐ d 3 and toluene‐2,3,4,5,6‐ d 5 were studied. The results showed that in these slow reactions, the ‘preference factor’ defined as the ratio of the probability of loss of a hydrogen atom from a side‐chain position to loss of a hydrogen atom from a ring position was 1.00. The ‘isotope factor,’ defined as the ratio of the probability of loss of a hydrogen atom from any position to that for the loss of a deuterium atom from the same position was found to be 3·50.