2,3,5,6-Tetra­kis[3,5-bis­(trifluorometh­yl)phen­oxy]-2,5-bis(dimethyl­amino)2,3,5,6-tetra­bora-1,4-dioxane diethyl ether 0.667-solvate

The title compound, C₃₆H₂₆B₄F₂₄N₂O₆·0.667C₄H₁₀O, has centrosymmetric tetra­bora­dioxane mol­ecules, half each of three of these comprising the asymmetric unit together with a mol­ecule of diethyl ether. Disorder affects most of the CF₃ groups and one ethyl group of the solvent mol­ecule. The B₄O₂ rings are approximately planar and contain two B atoms with trigonal geometry and two with distorted tetra­hedral geometry, the B-O bonds for the four-coordinate B atoms being longer than those for the three-coordinate B atoms. N-H...O hydrogen bonds link two of the crystallographically independent mol­ecules together in chains, while the third mol­ecule forms discrete trimolecular clusters with two solvent mol­ecules via N-H...O hydrogen bonds. This is the first crystallographically characterized example of a tetra­bora-dioxane mol­ecule containing both four- and three-coordinate B atoms.