Synthesis, structure and fluxional behavior of 4-sila-, 4-germa- and 4-stanna-3a,4,4a,8-tetrahydro-4,4,8,8-tetramethyl-s-indacenesстатьяИсследовательская статья
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Дата последнего поиска статьи во внешних источниках: 27 мая 2015 г.
Аннотация:4-Elementa-3a,4,4a,8-tetrahydro-4,4,8,8-tetrahydro-s-indacenes were obtained as a result of interaction of dilithiated dicyclopentadienyldimethylmethane with dichlorodimethylsilane, -germane, and -stannane, and their 1H and 13C NMR spectra were studied in detail. Tin and germanium derivatives in solution were found to be equilibrium mixtures of syn and anti isomers with respect to the mutual orientation of their allylic hydrogens at C(3a) and C(4a). The interconversion of these isomers occurs because of the elementotropic rearrangements. The mechanism of the processes was ascertained by use of 2D ACCORDION experiments, and the kinetic parameters were determined by means of complete line-shape analyses of the dynamic NMR spectra. Prototropic rearrangements were observed for 4-sila-3a,4,4a,8-tetrahydro-4,4,8,8- tetramethyl-s-indacene.