NMR study of the sigmatropic [1,3]-B shift in 7,8-dipropyl-7-borabicyclo[4.2.2]deca-2,4,9-triene |
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| Authors: | I D Gridnev M E Gurskii A O Krasavin Yu N Bubnov |
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| Institution: | (1) A. N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, 28 ul. Vavilova, 117813 Moscow, USSR;(2) N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 47 Leninsky prosp., 117913 Moscow, USSR;(3) The Higher Chemical Colledge of the Russian Academy of Sciences, 9 Miusskoya pl., 125047 Moscow, USSR |
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| Abstract: | Activation parameters of the interconversion of geometric isomers6a and6b were determined by a complete lineshape analysis of the temperature-dependent13C NMR spectra of 7,8-dipropyl-7-borabicyclo4.2.2]deca-2,4,9-triene (6). For the reaction6a  6b,  G
298 = 52.2±0.1 kJ mol–1, H
= 27.9±0.5 kJ mol–1, S = –82±8 J mol–1 K–1; For the reaction6b 6a, G
298 = 52.6±0.1 kJ mol–1, H
= 24.7±0.5 kJ mol–1, S
= –93±10 J mol–1 K–1. The interconversion of deuteropyridine complexes9a and9b proceedsvia their dissociation, which indicates that the rearrangement of borane6 occurs according to the 1,3]-B shift mechanism.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 9, pp. 2243–2250, September, 1996. |
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| Keywords: | allylboranes [1 3]-B shift dynamic NMR activation parameters |
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