The solvates of 1,2-bis(bromomethyl)-3,4,5,6-tetraphenylbenzene
✍ Scribed by Paweł Szlachcic; Wojciech Migda; Katarzyna Stadnicka
- Publisher
- Elsevier Science
- Year
- 2007
- Tongue
- English
- Weight
- 1013 KB
- Volume
- 839
- Category
- Article
- ISSN
- 0022-2860
No coin nor oath required. For personal study only.
✦ Synopsis
Solvates of 1,2-bis(bromomethyl)-3,4,5,6-tetraphenylbenzene (1) were obtained, and their crystal structures were determined by X-ray diffraction. Crystal structure analysis indicated the following chemical compositions of solvates: 1AEbenzene (2), 1AE1/2 toluene (3), 1AE1/2 chlorobenzene (4) and 1AE1/4 ethyl acetate (5) were found by crystal structure analysis. 3 and 4 crystallize in orthorhombic space group Pccn, whereas 2 and 5 are monoclinic, space group P2 1 /c. In a different crystalline environment the conformation of 1 differs significantly. Some similarities could be found in the structures of 3 and 4. In the structure of 5 two symmetrically independent molecules also adopt different conformations. The packing of the molecules is similar in all the structures, with open channels filled by disordered solvent molecules. DFT calculations performed for the isolated molecule of 1 revealed the highest preference for the anti arrangement of the bromomethyl groups which was also observed in the crystalline state. An attempt to explain the lack of reactivity of 1 towards formation of the propellane derivatives was made.
📜 SIMILAR VOLUMES
The title compound, C 29 H 24 Br 2 , has crystallographic twofold rotation symmetry. The Br atom in the 2 position is disordered with the methyl group in the 6 position. The biphenyl bridge bond distance and the torsion angle between the rings are in good agreement with similar previously reported s
## Abstract Under basic conditions 2,6‐bis(bromomethyl)‐4‐pyrone **8** reacts with tetraethylene glycol to yield the unexpected macrocycle **9**, which is related to the antibiotic Kjellmanianone **10**. We propose that this ring transformation proceeds __via__ the cyclopropyl intermediate **d** (S
Single-crystal X-ray study T = 292 K Mean (C-C) = 0.006 A Disorder in solvent or counterion R factor = 0.049 wR factor = 0.112 Data-to-parameter ratio = 11.3 For details of how these key indicators were automatically derived from the article, see http://journals.iucr.org/e.