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-diborab