Crystal structure of rac-3,9-bis(2,6-difluorophenyl)-2,4,8,10-tetraoxaspiro[5.5]undecane

Acta Crystallographica Section E: Crystallographic Communications

Liang Chen¹  Linlin Jin²  Zhengyi Li²  Zhiming Wang²  Xiaoqiang Sun² 

[1] Advanced Catalysis and Green Manufacturing Collaborative Innovation Center, Changzhou University, Changzhou 213164, Jiangsu, People's Republic of China;Key Laboratory of Fine Chemical Engineering, Changzhou University, Changzhou, 213164, Jiangsu, People's Republic of China;

关键词: crystal structure;    oxo-spirocyclic;    helical hydrogen-bonded chains;    axial chirality;   

DOI  :  10.1107/S2056989015001206

来源: DOAJ

【 摘 要 】

The title compound, C19H16F4O4, was prepared by the condensation reaction of 2,6-difluorobenzaldehyde and pentaerythritol. The whole molecule is generated by twofold rotational symmetry. The two six-membered O-heterocycles adopt chair conformations through a shared spiro-carbon atom that is located on the crystallographic twofold rotation axis. In this conformation, the two aromatic rings are located at the equatorial positions of the O-heterocycles. The conformation of this doubly substituted tetraoxaspiro system is chiral. In the crystal, molecules are linked by C—H...O hydrogen bonds, forming layers parallel to (100). These layers are linked by C—H...F hydrogen bonds into a three-dimensional structure.

【 授权许可】

Unknown