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Mass spectra of methylsubstituted monosila‐ and monogermacyclobutanes, 1,2‐ disila‐ and 1,2‐digermacyclopentanes. Some correlations with thermal decomposition
Author(s) -
Yu. Orlov V.,
Gusel'nikov L. E.,
Nametkin N. S.,
Ushakova R. L.
Publication year - 1972
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.1210060309
Subject(s) - mass spectrum , fragmentation (computing) , electron ionization , thermal decomposition , ion , decomposition , chemistry , spectral line , analytical chemistry (journal) , mass spectrometry , organic chemistry , physics , ionization , chromatography , astronomy , computer science , operating system
The mass spectra of 1,1‐dimethyl‐1‐silacyclobutane (I—as reported by Cherniak et al. ), 6 , 1,1‐dimethyl‐1‐germacyclobutane (II), 1,1,2,2‐tetramethyl‐1,2‐disilacyclopentane (III) and 1,1,2,2‐tetramethyl‐1,2‐digermacyclopentane (IV) are compared and some correlations between electron‐impact fragmentation and thermal decomposition are derived. The mass spectra of the germanium compounds with respect to the silicone compounds are enriched by light fragment ions and exhibit lower intensities of odd‐electron ions. The composition of some ions and apparently of neutral fragments coincides with that of the unstable intermediates which are suggested in the thermal decomposition mechanism of some related compounds. The loss of C 2 H 4 is more characteristic under electron‐impact as well as in thermal decomposition of Si‐compounds, while C 3 H 6 is preferable eliminated by the Ge‐compounds.