Mono deuterio-1,5-dimethylsemibullvalene is studied by the isotopic perturbation method with respect to the equilibrium of the valence isomerhation. It emerges that deuterium prefers the cyclopropane position. From the temperature dependence of the splittings in the 13C NMR spectra the ground state enthalpy difference in mono deuterio-1,5-dimethylsemibdvalene is calculated to be 484 J m0l-l.

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Umlagerungsreaktionen von Semibullvalenen (l)./(ll) werden untersucht.