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Organometallic compounds. VI . Electron impact fragmentation of some mixed and symmetrical tetraalkyltins

Published on Sep 2, 2010in Bulletin des Sociétés Chimiques Belges
· DOI :10.1002/bscb.19680770105
Stéphane Boué8
Estimated H-index: 8
(ULB: Université libre de Bruxelles),
Marcel Gielen35
Estimated H-index: 35
(ULB: Université libre de Bruxelles),
Jacques Nasielski10
Estimated H-index: 10
(ULB: Université libre de Bruxelles)
Abstract
The mass spectra of mixed tetraalkyltins are described and analysed. The fragmentation pattern is in agreement with the hypothesis of prefered Sn(IV) and Sn(II) valence states in the tin‐containing fragments. These states are reached by losing an alkyl radical from the next higher unfavourable valence state, or by losing an alkene or alkane molecule from a favourable valence state. The ease of cleavage of a carbon‐tin bond in the molecular ion parallels the stabilization of the leaving alkyl radical by hyperconjugation. The findings are tentatively extrapolated to the general behaviour of tetraalkyl derivatives of group IV organometallics. Copyright © 1968 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim
  • References (8)
  • Citations (32)
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References8
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#1J. J. De Ridder (UU: Utrecht University)H-Index: 9
#2G. Dijkstra (UU: Utrecht University)H-Index: 10
This paper reports the monoisotopic mass spectra of the tetramethyl and tetraethyl compounds of carbon, silicon, germanium, tin and lead. Metastable ion transitions and appearance potentials are given. The primary ionization results in an electron deficiency on the metal atoms, which attain electron configurations similar to those of the third-group elements. The stabilities of the valence states of these elements explain the cracking patterns.
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#2Marcel Gielen (ULB: Université libre de Bruxelles)H-Index: 25
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Resume Il resort de nos travaux que la reaction d'halogenmetallation des tetraalkyletains est considerablement influencee par trois proprietes du solvant: sa constante dielectrique, sa polaribalilite et sa nucle'ophilic. L'activite polyvalente du solvant est liee l'aptitude de l'etain a mettre en oeuvre ses orbitales 5 d vides; la polarisation C←Sn, subsequente a la pentacoordination du metal, regit la reactivite des groupes alkyles auxquels it est associe est associe mais cette ractivite est pe...
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The mass spectra of a series of hexaalkyldimetals are described and discussed. The fragmentation rules available in the literature for organometallic compounds of group IV B are also valid here. The PMR spectra of these derivatives have been recorded and analyzed. Copyright © 1971 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim
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