Abstract
The resonance donor effect of the σ,π conjugation of R3M and R3MCH2 (M = Si, Ge, Sn; R is an alklyl group) substituents with the triple bond in compounds R3MC=CX and R3MCH2C≡CX (X = H, R) changes on passing from isolated molecules to their H-complexes. A partial δ+ charge on the triple bond enhances σ,π conjugation; a partial δ− charge on the triple bond has practically no effect on the resonance properties of R3M substituents, whereas the σ,π conjugation of R3MCH2 substituents diminishes owing to the effect of negative direct resonance interaction. The effect of σ,π conjugation on the effective negative charges of the carbon atoms in the -C≡C- fragments was estimated quantitatively.
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Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 6, pp. 1041–1046, June, 1994.
This work was supported by the Russian Fundation for Basic Research (Grant 93-03-18372).
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Egorochkin, A.N., Skobeleva, S.E., Bogoradovsky, E.T. et al. Charge control in the formation of complexes of phenol with unsaturated compounds containing organometallic substituents from group IV. Russ Chem Bull 43, 976–982 (1994). https://doi.org/10.1007/BF01558061
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DOI: https://doi.org/10.1007/BF01558061