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Rearrangements and fragmentations of [C2H5S]+ ions

โœ Scribed by W. J. Broer; W. D. Weringa; W. C. Nieuwpoort

Publisher
John Wiley and Sons
Year
1979
Tongue
English
Weight
741 KB
Volume
14
Category
Article
ISSN
1076-5174

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โœฆ Synopsis

From deuterium labelling experiments it was concluded that metastable molecular ions of ethyl methyl sulfide lose a methyl radical with the formation of both CCH,!+=CH,]+ and [CH,CH=SH]'. The fragmentation reactions of metastable ions generated with these structures are losses of C,H,, H,S and C&. These reactions and the preceding isomerizations have also been studied by means of deuterium labelling. From the results it is concluded that the three fragmentation reactions most probably occur from ions with a C-C-S skeleton. Appearance energy measurements for ions generated with the two structures above and [CHpCH,-SH]'

all give rise to the same AH, value for these three isomeric forms. Ab initio molecular orbital calculations confirm that these three ions fortuitously have very similar heats of formation. A potential energy diagram rationalizing the isomerizations and the principal fragmentation reaction is presented.

Scheme 1

๐Ÿ“œ SIMILAR VOLUMES

Fragmentations and rearrangements of met
Fragmentations and rearrangements of metastable [C2H5OS]+ ions
โœ M. P. de Vries; D. Oudman; W. D. Weringa ๐Ÿ“‚ Article ๐Ÿ“… 1992 ๐Ÿ› John Wiley and Sons ๐ŸŒ English โš– 309 KB

Several [ C,H,OS] + ions with different structures were generated from the appropriate precursors and their metastable ion spectra were determined. Deuterium labelled analogues of some of the I C,H,OS) + ions were used to elucidate the nature of the observed fragmentations and their mechanisms. IC,H

Rearrangements and fragmentations of met
Rearrangements and fragmentations of metastable [C13H9S]+, [C14H11]+, [C13H11]+ and [C8H7S]+ ions
โœ Marcel Rietjens; Drewes Oudman; Wilke D. Weringa ๐Ÿ“‚ Article ๐Ÿ“… 1990 ๐Ÿ› John Wiley and Sons ๐ŸŒ English โš– 334 KB

## Abstract [C~13~H~9~S]^+^, [C~14~H~11~]^+^, [C~13~H~11~]^+^ and [C~8~H~7~S]^+^ ions with unknown structures were generated from two [C~14~H~12~S]^+ยท^precursor ions by fragmentation reactions that must be preceded by extensive rearrangements. Ions with the same compositions, each with several init

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โœ M. Sirois; J. L. Holmes; C. E. C. A. Hop ๐Ÿ“‚ Article ๐Ÿ“… 1990 ๐Ÿ› John Wiley and Sons ๐ŸŒ English โš– 614 KB

The low-energy fragmentation characteristics of the [H, ,C,N,O,]+' isomers [H,CNOJ+' (a), [H,C=N(O)OHJ+' (b), [H,CONO]+' (c), [HC(O)NHOH]+' (d) and [HC(OH)=NOH]+' (e) were studied in detail by metastable ion mass spectrometry. In agreement with most earlier observations, appearance energy measuremen