Abstract
The parameters of13C NMR spectra of linear and cyclic alkenylalanes synthesized from mono- and disubstituted acetylene and the simplest alkylalanes have been obtained. A strong paramagnetic effect of the aluminum atom on shielding of α- and β-carbon atoms at the double bond has been observed for the dimeric form of organoaluminum compounds (OAC) in inert solvents, unlike that for the monomeric form solvated in electron-donor solvents (Et2O, THF, and Et3N). The results were interpreted in terms of the model of the electron density redistribution on going from the dimeric structure of OAC to the monomeric one. The PM3 method describes most adequately (as compared to MNDO and AM1) the equilibrium geometry of cyclic dimers of OAC.
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Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 12, pp. 2194–2197, December, 1997.
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Muslukhov, R.R., Khalilov, L.M., Ramazanov, I.R. et al. 13C NMR spectra and electronic structure of alkenylalanes. Russ Chem Bull 46, 2082–2085 (1997). https://doi.org/10.1007/BF02495255
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DOI: https://doi.org/10.1007/BF02495255