Structure of tetrafluoro-1,2-(RS)-bis(2,2,3,3-tetrafluorocyclobutyl)ethane

Abstract

Tetrafluoro-1,2-(R S)-bis(2,2,3,3-tetrafluorocyclobutyl)ethane, Ct0H6Faz, crystallizes in space group P2~/c with Z = 2 and cell parameters a = 5.154 (5), b = 10.010(7), c = 12.559(12) A and fl = 113°45 (10)'. The crystal structure has been determined by X-ray diffraction (763 observed reflexions; final R value 0.064). The conformation of the molecule is governed by the steric and electrostatic interactions of the substituents. Steric hindrance is minimized by the adoption of a staggered configuration by the carbon chain. By contrast, the cyclobutane ring is only slightly puckered (torsion angles of 4 °) with substituents in the eclipsed conformation.