has been observed in the UV–vis spectra. Moreover, compounds 2 and 4 were further converted to stable singlet biradicaloid dicarbene-coordinated (Ln:)2Si(0) (n = 1 (9), 2 (10)) under KC8 reduction. Compounds 2 and 4 were also reduced to dehalogenated products 9 and 10, respectively when treated with RLi (R = Ph, Me, tBu). Cyclic voltametry measurements show that 10 can irreversibly undergo both one
已经开发了两种不同的通式为(L n •)2 SiX 2(n = 1,2)的二卤化
硅桥联双自由基的合成方法。首先,NHC:SiX 2与L n:(L n:=环烷基(
氨基)卡宾以1:3的摩尔比进行的复分解反应导致产物2(n = 1,X = Cl),4(n = 2,X = Cl)的,6(ñ = 1,X = Br)和7(ñ = 2,X = Br的)。这些反应还产生耦合的NHC(3,5)在C–C键形成下。在复分解反应过程中,偶联的NHC(L m =环状烷基(
氨基)卡宾取代的N-杂环卡宾;m = 3,n = 1(3),m = 4,n = 2(5))的形成更快与NHC:SiCl 2相比,NHC:SiBr 2和L n之间的差值在NHC:SiBr 2和L n之间。第二,L 1:SiCl 4(8)(L 1:=:C(CH 2)(CMe 2)2 N-2,6- i Pr 2 C具有非亲核碱LiN(i Pr)2且摩尔比为1:1的6