Molekül- und Kristallstruktur des 1.5-Dichlor-3.7-bis(trifluormethyl)-4.8-bis(2′.6′-dimethylphenyl)-2.6.9-trioxa- 4.8-diaza-1.5-diborabicyclo [3.3.1] nonadiens / Molecular and Crystal Structure of 1,5-Dichloro-3,7-bis(trifluoromethyl)-4,8-bis(2′,6′-dimethylphenyl)-2,6,9-trioxa-4,8-diaza- 1,5-diborabicyclo[3,3,1 ]nonadiene

The structure of the title compound (a = 1185.4, b = 1197.7, c = 1764.8 pm, β = 73.96°, space group P21/c) has been determined from X-ray diffractometer data. The molecule is structurally analogous to the tetraborate ion [B4O7]2-. The eight-membered ring is folded by 104° about the B - B vector. The boron atoms are more strongly bonded to the bridging oxygen [B-O(B) 139 pm] than to the other atoms [B-O(C) 155 pm, B-N 160 pm, B-Cl 182 pm].