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

Acta Crystallographica Section E: Crystallographic Communications

Chen, L.¹  Sun, X.²  Li, Z.²  Jin, L.²  Wang, Z.² 

[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

学科分类：数学（综合）

来源: International Union of Crystallography

【 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】

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