Crystal structure of rac-3,9-bis-(2,6-di-fluoro-phen-yl)-2,4,8,10-tetra-oxa-spiro[5.5]undeca-ne.

ABSTRACT: The title compound, C19H16F4O4, was prepared by the condensation reaction of 2,6-di-fluoro-benzaldehyde and penta-erythritol. The whole mol-ecule 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 tetra-oxa-spiro system is chiral. In the crystal, mol-ecules 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.

SUBMITTER: Chen L 

PROVIDER: S-EPMC4384547 | biostudies-literature | 2015 Feb

REPOSITORIES: biostudies-literature