Group IVb metalloidal substituent effects studied by carbon-13 nuclear magnetic resonance spectroscopy

M.Bullpitt M.BullpittMaxwellM.Bullpitt M.BullpittMaxwellhttps://api.elsevier.com/content/author/author_id/15921237200 (1976) Group IVb metalloidal substituent effects studied by carbon-13 nuclear magnetic resonance spectroscopy. Journal of Organometallic Chemistry, 116 2: 161-185. doi:10.1016/S0022-328X(00)91791-1


Author M.Bullpitt M.BullpittMaxwellM.Bullpitt M.BullpittMaxwellhttps://api.elsevier.com/content/author/author_id/15921237200
Title Group IVb metalloidal substituent effects studied by carbon-13 nuclear magnetic resonance spectroscopy
Journal name Journal of Organometallic Chemistry   Check publisher's open access policy
ISSN 0022-328X
Publication date 1976-08-01
Sub-type Article (original research)
DOI 10.1016/S0022-328X(00)91791-1
Open Access Status Not yet assessed
Volume 116
Issue 2
Start page 161
End page 185
Total pages 25
Language eng
Subject 1303 Biochemistry
1606 Physical and Theoretical Chemistry
1605 Organic Chemistry
1604 Inorganic Chemistry
2505 Materials Chemistry
Abstract The natural abundance carbon-13 NMR spectra of series of compounds ArX(CH) (At = phenyl, 1- and 2-naphthyl, 4-biphenyl and 9-anthryl; X = C, Si, Ge, Sn, Pb), have been recorded and essentially completely assigned by specific deuteration, magnitudes of CX couplings and other criteria. For these directly bonded metalloidal systems, the substituent chemical shifts at formally conjugated positions have been considered in terms of mesomeric electron withdrawal, associated with orbitals of π-symmetry on X, and opposing electron donation, resulting from the aryl CX bond polarisation. For silicon the former effect predominates, but for germanium, tin and lead, opposing electron-donating mechanisms assume importance. For 1-naphthyl systems, the effects of molecular distortion on carbon-13 chemical shifts are critical at certain positions. The substituent effects of M(CH) in aromatic systems are very feeble in comparison with the conventional substituents of organic chemistry.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Scopus Import - Archived
 
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Created: Tue, 12 Sep 2017, 00:04:34 EST by System User