Enantioselective preparative HPLC separation of the HBCD-Stereoisomers from the technical product and their absolute structure elucidation using X-ray crystallography

Chirality ◽  
2007 ◽  
Vol 19 (3) ◽  
pp. 214-222 ◽  
Author(s):  
Robert Koeppen ◽  
Roland Becker ◽  
Franziska Emmerling ◽  
Christian Jung ◽  
Irene Nehls
Keyword(s):  
Structure Elucidation ◽  
Preparative Hplc ◽  
Hplc Separation ◽  
Technical Product ◽  
X Ray ◽  
X Ray Crystallography ◽  
Absolute Structure

scholarly journals A pentacyclic triterpene from Maytenus imbricata: structure elucidation by X-ray crystallography

2006 ◽  
Vol 17 (1) ◽  
pp. 149-153 ◽  
Author(s):  
Alécio Antonio Pimenta ◽  
Sílvia Ribeiro de Souza e Silva ◽  
Grácia Divina de Fátima Silva ◽  
Luiz Cláudio de Almeida Barbosa ◽  
Javier Ellena ◽  
...  
Keyword(s):  
Structure Elucidation ◽  
Pentacyclic Triterpene ◽  
X Ray ◽  
X Ray Crystallography ◽  
Maytenus Imbricata

Vapour growth, morphology, absolute structure and pyroelectric coefficient of meta-nitroaniline single crystals

2019 ◽  
Vol 52 (3) ◽  
pp. 564-570 ◽  
Author(s):  
Rolf Hesterberg ◽  
Michel Bonin ◽  
Martin Sommer ◽  
Matthias Burgener ◽  
Bernhard Trusch ◽  
...  
Keyword(s):  
Room Temperature ◽  
Vapour Phase ◽  
Pyroelectric Coefficient ◽  
Growth Speed ◽  
Published Data ◽  
X Ray ◽  
X Ray Crystallography ◽  
Absolute Structure ◽  
Good Agreement

The growth speed of (hkl) faces in the vapour phase, the absolute structure obtained by X-ray crystallography, and the value and the sign of the pyroelectric coefficient of meta-nitroaniline (mNA) were analysed in detail. The in situ observation of morphologically well developed faces of several mNA crystals growing in evacuated ampoules reveals no pronounced growth speed anisotropy for polar faces defining the unique axis 2 of the mm2 group. Scanning pyroelectric microscopy confirms mono-domain mNA crystals. X-ray measurements in the space group Pca21 show that the molecular planes coincide with the {\bar 211} and {\bar 2\bar 1\bar 1} faces, and the nitro groups cover the {201} face in the opposite direction to the crystal tip, characterizing the polar habitus studied here. At room temperature, the sign of the pyroelectric coefficient is positive for a measured effective value of 6.3 µC m−2 K−1, in good agreement with values reported by other authors. From previous elastic and piezoelectric published data, the secondary pyroelectric effect was calculated to be positive and far greater than the effective one, yielding a negative value for the primary pyroelectric coefficient.

Structure elucidation of roemeridine by X-ray crystallography

1989 ◽  
Vol 28 (6) ◽  
pp. 1779-1781 ◽  
Author(s):  
Jaroslav Podlaha ◽  
Jana Podlahová ◽  
Jindřich Symerský ◽  
František Tureček ◽  
Vladimír Hanuš ◽  
...  
Keyword(s):  
Structure Elucidation ◽  
X Ray ◽  
X Ray Crystallography

Epikatonic acid fromAustroplenckia populnea: structure elucidation by 2D NMR spectroscopy and X-ray crystallography

2002 ◽  
Vol 40 (5) ◽  
pp. 366-370 ◽  
Author(s):  
G. D. F. Silva ◽  
L. P. Duarte ◽  
S. A. Vieira Filho ◽  
A. C. Doriguetto ◽  
Y. P. Mascarenhas ◽  
...  
Keyword(s):  
Nmr Spectroscopy ◽  
Structure Elucidation ◽  
2D Nmr ◽  
2D Nmr Spectroscopy ◽  
X Ray ◽  
X Ray Crystallography
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