U. Haffer et al., SYNTHESIS AND X-RAY CRYSTAL-STRUCTURE OF 1,2,4,6,7,9-HEXAFLUORODIBENZO-P-DIOXIN, Journal of fluorine chemistry, 73(2), 1995, pp. 265-266
1,2,4,6,7,9-Hexafluorodibenzo-p-dioxin was synthesized from 2,3,4,6-te
trafluorophenol in the presence of sodium-t-butylate. An X-ray structu
re analysis has been performed. The molecule is essentially planar and
possesses a centre of inversion. The C-C bond distances range from 13
6.3(7) to 138.3(6) pm and the C-F distances from 133.8(5) to 134.5(6)
pm. The C-O distances are 137.8(5) and 139.1(6) pm, respectively.