“…Recently, we showed that protonolysis of a TaeMe bond in complex [TaCp * Me 4 ] with several alcohol and silanol compounds was a suitable method for the synthesis of new monocyclopentadienyl complexes [TaCp * Me 3 (OR)] (R ¼ SiiPr 3 , 2,6-Me 2 C 6 H 3 , 2,6-iPr 2 C 6 H 3 ) [42]. We also reported their reactions with the Lewis acids E(C 6 F 5 ) 3 (E ¼ B, Al) and studies on polymerization of MMA with the systems [TaCp * Me 3 X]/E(C 6 F 5 ) 3 , observing that the polymerization was dependent on the X group (X ¼ Me, OR) and E (E ¼ B, Al).…”