Abstract
IR studies of SnF2 and hept-1-yne codeposited in an argon matrix at 12 K has revealed new bands at 540, 565, 1011, 2088 and 3256 cm−1, assigned to the formation of a complex between SnF2 and the alkyne. Quantum chemical AM1 and PM3 calculations confirm this assignment to the π-complex of SnF2 and the triple bond of hept-1-yne, and show that the complex forms without an activation barrier. The energy of the formation of the complex according to AM1 and PM3 calculations is 7.4 and 9.1 kcal/mol, respectively. The calculations indicate that the product of the cycloaddition of SnF2 to a triple bond, stannyrene, is significantly less stable than the π-complex.
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Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 1, pp. 54–56, January, 1994.
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Boganov, S.E., Faustov, V.I., Egorov, M.P. et al. Matrix IR spectra and quantum chemical studies of the reaction between difluorostannylene and hept-1-yne. The first direct observation of a carbene analog π-complex with alkne. Russ Chem Bull 43, 47–49 (1994). https://doi.org/10.1007/BF00699133
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DOI: https://doi.org/10.1007/BF00699133