Unkonventionelle Lewis-Paare zwischen der Lewis-Säure B(C6F5)3 mit sauerstoffatomhaltigen Lewis-Basen

Abstract

Current research focuses on the synthesis of stable disaggregated p-block element-oxygen compounds. It was shown that some of them are capable of binding the greenhouse gas carbon dioxide. Furthermore, research has been conducted for more acidic BrA nsted acids, to be used in chemical synthesis and catalysis. Against this background this PhD thesis describes the Lewis acid induced disaggregation of dimeric antimony oxides (Ph3SbO)2 and 2,6-(Me2NCH2)2C6H3SbO 2 by B(C6F5)3 and the formation of Ph3SbOB(C6F5)3 and 2,6-(Me2NCH2)2C6H3SbOB(C6F5)3. In addition, it is shown that the BrAA nsted acidity of Ph2P(O)OH can be increased significantly by B(C6F5)3 resulting in the formation of the metastable acid Ph2(HO)POB(C6F5)3. Elimination of C6F5H by autoprotolysis gave rise to the eight-membered boraphosphinate ring Ph2POB(C6F5)2O 2. Furthermore, the reaction of Ph2PHO and B(C6F5)3 with (tht)AuCl provided the push-pull complex (C6F5)3BOPPh2 Au(tht) containing a zwitterionic a OPPh2Aua unit, being stabilized by a hard pulling Lewis acid and a soft pushing Lewis base. Finally, the formation of six adducts between B(C6F5)3 and archetypical alcoholates and carboxylates are described, e.g. Na(15-crown-5) CH3OAA B(C6F5)3 and Na(15-crown-5) HCO2AA B(C6F5)3 .