High resolution NMR studies of allylic derivatives of group IVB elements |
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Authors: | RG Jones P Partington WJ Rennie RMG Roberts |
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Institution: | Chemistry Department, University of Essex, Colchester Great Britain |
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Abstract: | The high resolution NMR spectra of certain Group IVB allyl compounds, FC3M(CH2)nCHCH2R′ (where R = Me, Et, Ph; R′ = H, Ph; M = Sn, Si, Ge; n = 1 or 2), have been studied in an attempt to detect manifestations of ground state pπdπ overlap. Analyses, using sub-spectral techniques for ABMX2 and ABX2 systems, were confirmed using computer iteration methods. The emphasis has been placed here on the sensitivity of the coupling constants of the allyl group towards anticipated steric and electronic perturbation or towards the interaction between the Group IVB atom d orbitals and the olefinic pπ orbitals. Some 119Sn chemical shifts have also been recorded. The conclusions reached do not support the existence of ground state dπpπ overlap in these compounds. |
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