Complexation and Versatile Reactivity of a Highly Lewis Acidic Cationic Mg Complex with Alkynes and Phosphines
作者:Jürgen Pahl、Tom E. Stennett、Michel Volland、Dirk M. Guldi、Sjoerd Harder
DOI:10.1002/chem.201804802
日期:2019.2.6
by the BDI ligand to give [(BDI‐H)Mg+(C≡CPh)]2⋅2 [B(C6F5)4−] (2, 70 %) and [(BDI‐H)Mg+(C≡CSiMe3)]2⋅2 [B(C6F5)4−] (3, 63 %). Addition of internal alkynes PhC≡CPh or PhC≡CMe led to [4+2] cycloadditions with the BDI ligand to give Mg+C(Ph)=C(Ph)C[C(Me)=NDipp]2}2⋅ 2 [B(C6F5)4−] (4, 53 %) and Mg+C(Ph)=C(Me)C[C(Me)=NDipp]2}2⋅2 [B(C6F5)4−] (5, 73 %), in which the Mg center is N,N,C‐chelated. The (BDI)Mg+
[(BDI)Mg + ] [B(C 6 F 5)4 - ](1 ; BDI = CH [C(CH 3)NDipp] 2 ; Dipp = 2,6-二异丙基苯基)是通过(BDI)反应制备的毫克ñ镨与[PH 3 ç + ] [B(C 6 ˚F 5)4 - ]。3-己炔的加成,得到[(BDI)的Mg + ⋅(EtC≡CEt)] [B(C 6 ˚F 5)4 -]。单晶X射线分析,NMR研究,拉曼光谱和DFT计算表明镁炔炔之间存在显着相互作用。所述末端炔PhC≡CH或Me的加成3 SiC≡CH导致炔去质子化由BDI配体,得到[(BDI-H)的Mg +(C≡CPh)] 2 ⋅ 2 [B(C 6 ˚F 5)4 - ](2,70%)和[(BDI-H)的Mg +(C≡CSiMe 3)] 2 ⋅ 2 [B(C 6 ˚F 5)4 - ](3,63%)。内炔PhC≡CPh或PhC≡CMe的加成导致[4 + 2]与BDI环加成配体,得到镁+