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The mass spectra of some tris(trimethylsilyl)acylsilanes and tris(trimethylsilyl)silanes
Author(s) -
Brook Adrian G.,
Harrison Alex. G.,
Kallury R. Krishna M. R.
Publication year - 1982
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.1210170803
Subject(s) - trimethylsilyl , chemistry , tris , ion , alkyl , mass spectrum , silanes , photochemistry , cleavage (geology) , metastability , aryl , polymer chemistry , medicinal chemistry , organic chemistry , silane , materials science , biochemistry , fracture (geology) , composite material
While tris(trimethylsilyl) alkanoylsilanes fragment in the acylsilane form yielding [(Me 3 Si) 3 SiCO] + by α‐cleavage, the molecular ions of their aryl counterparts rearrange to ionized silaethenes prior to cleavage, paralleling known photochemical behaviour. Sila‐allyl type structures are attributed to the stable [MMe˙] + ions obtained by subsequent cleavage. Metastable ion characteristics reveal the identity of the structures of the monomeric silaethene ions obtained from one of the aroylsilanes and a 1,2‐disilacyclobutane. The non‐compliance of the alkanoylsilanes with their photochemical behaviour is attributed to a preferred elimination of the stable alkyl radical (R˙) from the molecular ions. Several polysilanes display abundant odd‐electron ions which may possess a disilene structure.