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The addition of amidines to 1,2,3-triketohydrindenhydrat gives cyclic dihydroxyindenoimidazoles. From N-substituted amidines mixtures of regioisomeric derivatives were obtained. Analysis of crystals revealed the major product of 2k to be 4k. They belong to the monoclinic space group P2 1 /c (a = 889.1(2); b = 1186.6(3); c = 2783.5(7) pm; β = 91.26(2)°) with Ζ = 8 molecules including four molecules of ethanole per unit cell. These results were confirmed by oxidation with lead(IV)acetate, which lead to derivatives of isoindols.

zeitschrift für naturforschung b

Amidinadditionsprodukte des 1,2,3-Indantrionhydrats: Synthese und Strukturzuordnung durch Kristallstrukturanalyse, spektrale Daten und Blei(IV)acetatoxidation / Products of Amidinaddition to 1,2,3-Triketohydrindenhydrat: Synthesis and Determination by Crystal Structure, Spectral Data and Oxidation with Lead(IV)acetate