N,N'-Linked biazoles : Part 7. Oxidative dimerization of n-unsubstituted tetrahydroindazolones

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The structure of the products obtained by oxidative dimerization of tetrahydroindazolones was established as being N(1)-C(3a') dimers. In one case a C(3a)-C(3a') dimer was also isolated, but N-N'-Linked dimers were never found, contrary to a previous report in the literature. A complete 13-carbon nmr study of the monomers and their fixed methylated derivatives was performed to determine the most abundant tautomer in each case, since the tautomerism study of tetrahydroindazolone and of its 4-ethoxycarbonyl derivative was needed to fully determine the structure of the dimers.