Synthesis and structure of boron-bridged constrained geometry complexes of titanium
作者:Holger Braunschweig、Frank M. Breitling、Carsten von Koblinski、Andrew J. P. White、David J. Williams
DOI:10.1039/b315708c
日期:——
geometry titanium complexes [Ti[eta5:eta1-(C5H4)B(NR2)NPh](NMe2)2][R = iPr (3), SiMe3(4)] and [Ti[eta5:eta1-(C9H6)B(NiPr2)NPh](NMe2)2](12) have been prepared in good yields by amine elimination reaction from [Ti(NMe2)4]. Subsequent deamination-chlorination with excess Me3SiCl yielded the corresponding dichloro-complexes (5, 6, 13). Reaction of the analogous ligand precursors (C5H5)B(NiPr2)N(H)R (R = Cy,
硼桥约束几何钛配合物[Ti [eta5:eta1-(C5H4)B(NR2)NPh](NMe2)2] [R = iPr(3),SiMe3(4)]和[Ti [eta5:eta1- (C9H6)B(NiPr2)NPh](NMe2)2](12)是通过[Ti(NMe2)4]的胺消除反应制备的,收率很高。随后用过量的Me3SiCl进行脱氨基氯化反应,得到相应的二氯配合物(5、6、13)。类似配体前体(C5H5)B(NiPr2)N(H)R(R = Cy,tBu)与[Ti(NMe2)4]的反应未产生预期的桥连化合物,而是半夹心络合物[Ti [(η5-C5H4)B(NiPr2)N(H)R](NMe2)3] [R = Cy(9),tBu(10)]。所有化合物均通过多核NMR光谱进行了全面表征。通过对配合物3、5、6和12进行的比较X射线衍射研究,彻底研究了取代基的作用。