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Stereostructural behaviour of N-N atropisomers: Two conglomerate crystallisations and a crystallisation-induced deracemisation

Arthur, Richard J.; Coogan, Michael P.; Casadesus, Meritxell; Haigh, Robert; Headspith, D. A.; Francesconi, M. Grazia; Laye, Rebecca H.

Authors

Richard J. Arthur

Michael P. Coogan

Meritxell Casadesus

Robert Haigh

D. A. Headspith

Rebecca H. Laye

Abstract

The solid state behaviour of a number of compounds which show hindered rotation around an N-N bond, in some cases leading to axial chirality is described. A diacyl hydrazine, bisanthranoly hydrazine, 1 crystallises in the chiral space group P2(1)2(1)2(1), presenting an example of conglomerate crystallisation. A tetra-acyl hydrazine derived from lactic acid, 2, shows kinetic resolution by crystallisation, as of the two isomers observed in the solution NMR, only one crystallises, again in the space group P2(1)2(1)2(1). Two cyclic acyl hydrazines in the form of biquinazolinones are studied: 2,2'-diphenyl-3,3-biquinazolinone, 3 crystallises in the achiral space group Pbca, while 3,3'-dimethyl-2,2'-biquinazoline-4'-thio-4-one, 4 crystallises in the chiral space group P2(1) giving another example of a conglomerate crystallisation. The single crystal structures of each of the species have been compared to powder XRD data to confirm that the single crystal structures are representative of the bulk material.

Journal Article Type Article
Publication Date Mar 31, 2009
Journal CRYSTENGCOMM
Print ISSN 1466-8033
Electronic ISSN 1466-8033
Publisher Royal Society of Chemistry
Peer Reviewed Peer Reviewed
Volume 11
Issue 4
Pages 610-619
Institution Citation Arthur, R. J., Coogan, M. P., Casadesus, M., Haigh, R., Headspith, D. A., Francesconi, M. G., & Laye, R. H. (2009). Stereostructural behaviour of N-N atropisomers: Two conglomerate crystallisations and a crystallisation-induced deracemisation. CrystEngComm RSC, 11(4), 610-619. doi:10.1039/b814424a
DOI https://doi.org/10.1039/b814424a
Keywords General Materials Science; General Chemistry; Condensed Matter Physics