Abstract
The results of an investigation of 2-substituted furans and 5-trimethylsilylfurans by NMR spectroscopy and the CNDO/2 method showed that the chemical shifts of the different nuclei do not correlate sufficiently clearly with the calculated charges because of an additional change in the electron density under the influence of a π-d interaction. The 13C-29Si direct spin-spin coupling constants (SSCC) are less sensitive to this interaction, since they depend primarily on the inductive effects of the substituents.
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