Abstract
δ29Si and δ119Sn chemical shifts in the NMR spectra of acetylenic derivatives Me3EC≡CX (E = Si or Sn; X — organic substituents) and shifts of frequencies (Δν) of stretching vibrations of OH groups in the IR spectra of phenol when hydrogen-bonded to these compounds have been analyzed. In each of two series (E = Si or Sn), the δ and Δν values are connected by a linear relationship; this indicates that there is virtually no effect of the magnetic anisotropy of the X substituents on the chemical shifts. It has been established that the shifts of the Δν frequencies and the δ29Si and δ119Sn chemical shifts are the relative characteristics of the effective negative charge on the carbon atoms of the triple bond in Me3EC≡CX compounds.
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For the previous communication of this series, see Ref. 1.
Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 12, pp. 2069–2073, December, 1993.
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Egorochkin, A.N., Skobeleva, S.E., Tsvetkova, V.L. et al. Charge control of phenol complexation with unsaturated compounds containing group IVB organometallic substituents. Interpretation of NMR spectra of acetylenic derivatives. Russ Chem Bull 42, 1982–1985 (1993). https://doi.org/10.1007/BF00698879
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DOI: https://doi.org/10.1007/BF00698879