T. A. Molenaar‐Langeveld

Publications20
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Citations155
Highly Influential Citations0
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A chemical ionization study of deuteron transfer initiated propene loss from propoxypyridines
The mechanism of propene loss from the metastable [M + D]+ ions of isomeric 2-, 3-, and 4-n-propoxypyridines and the related isopropoxypyridines has been examined by chemical ionization (CI) and… Expand
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Isomeric dependence of the formation of ion/neutral complexes in dissociation reactions of ionized propoxypyridines
Abstract The mechanistic aspects of the dissociation reactions of the molecular ions of isomeric propoxypyridines have been examined with the use of deuterium labelling and tandem mass spectrometry.… Expand
  • 9
Skeletal rearrangements preceding CO loss from metastable phenoxymethylene ions derived from phenoxyacetic acid and anisole
The loss of CH2˙ from the molecular ion of phenoxyacetic acid and the expulsion of an H˙ atom from ionized anisole lead to phenoxymethylen ions, which fragment predominantly by CO loss on the… Expand
  • 7
On the 1,1‐elimination of nitrous acid and the loss of hydroxyl from the molecular ion of the methyl ester of γ‐nitrobutyric acid
  • 14
The unorthodox loss of propyl from the molecular ions of methoxycyclohexane
It is shown by field ionization kinetics, D and 13C labelling and metastable ion studies that the loss of a propyl radical from the molecular ion of methoxycyclohexane occurs via two routes. At a… Expand
  • 6
[C]+· and [CH]+ from doubly charged ions formed from malononitrile
The metastable ions [M]2+, [M – H]2+· and [M – H2]2+ from malononitrile fragment by loss of [CH]+, [C]+· and [C]+·, respectively. The reaction of the molecular ion involves the methylene and nitrile… Expand
  • 6
Mass spectrometry of aralkyl compounds with a functional group—XIII: The structure of the decomposing molecular ion of m-hydroxybenzylalcohol, elucidated by 18O- and D-labeling (six-membered- versus…
Abstract The mass spectra of m -hydroxybenzylalcohols, specifically labeled with 18 O in the benzylic hydroxyl group, with D in the methylene position and with D in both hydroxyl groups respectively,… Expand
  • 11
Isomerization of the molecular ion of cyclohexyl cyanide to an ionized bicycloheptane imine species competing with direct ring-opening
Abstract The mechanisms of the dissociation reactions of the molecular ion of cyclohexyl cyanide have been studied with nitrogen-15, carbon-13 and deuterium labelling in combination with tandem mass… Expand
  • 2
LOSS OF HYDROGEN-CYANIDE FROM MONOCYANOPYRIDINES UPON ELECTRON-IMPACT - DEWAR PYRIDINE STRUCTURES AND RING OPENING-RING CLOSURE REACTIONS REVEALED BY C-13-LABELING AND N-15-LABELING
Extensive 13C and 15N labelling has shown that the molecular ions of 2-, 3- and 4-cyanopyridine with lifetimes up to 10−6 s eliminate hydrogen cyanide originating predominantly from the ring (˜65%).… Expand
  • 16
Mass spectrometry of aralkyl compounds with a functional group—XII: Unorthodox elimination of hydrogen cyanide from hydrogen randomized molecular ions of benzylcyanide and of o‐, m‐ and…
Specific D-labelling in the side-chain and in the phenyl ring, 13C-labelling in the benzylic position and in the cyano group and 15N-labelling in the cyano group of benzylcyanide show, that the… Expand
  • 19