Solid-phase racemic compound–conglomerate transformation of 2,3:6,7-dibenzobicyclo[3.3.1]nona-2,6-diene-4,8-dione

Graphic For 2,3:6,7-dibenzobicyclo[3.3.1]nona-2,6-diene-4,8-dione (diketone), forming either a racemic compound ( R) or a conglomerate ( C) depending on the crystallization conditions, a solid-phase transformation (SPT) of R into C has been found. In addition, a solvent-mediated transformation of C...

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Bibliographic Details
Published in:Tetrahedron: asymmetry 2004-05, Vol.15 (9), p.1445-1450
Main Authors: Levkin, Pavel A, Schweda, Eberhard, Kolb, Heinz-Jürgen, Schurig, Volker, Kostyanovsky, Remir G
Format: Article
Language:English
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Summary:Graphic For 2,3:6,7-dibenzobicyclo[3.3.1]nona-2,6-diene-4,8-dione (diketone), forming either a racemic compound ( R) or a conglomerate ( C) depending on the crystallization conditions, a solid-phase transformation (SPT) of R into C has been found. In addition, a solvent-mediated transformation of C into R has been realized. The SPT has been investigated by DSC and X-ray powder diffraction analyses and its peritectoid nature is proposed. On the basis of the obtained data a diagram of Gibbs free energy versus temperature ( G vs T) for the two modifications of the diketone has been constructed.
ISSN:0957-4166
1362-511X
DOI:10.1016/j.tetasy.2004.03.020