An improved preparation of the methylene-di-Grignard reagent CH2(MgBr)2 (2) is described 2 is applied as a synthon for the preparation of 1,3-dimetallacyclobutanes (1) in a two step sequence. First,, two molar equivalents of 2 and one molar equivalent of a dichlorometallocene Cp2MCl2 (3) (M = Ti, Zr, Hf) are combined to form a 1,3-di-Grignard reagent Cp2M(CH2MgBr)2 (4) which with a metal dichloride
描述了改进的亚甲基二格里雅试剂CH 2(MgBr)2(2)的制备方法2被用作合成子,以两步顺序制备1,3-二
金属
环丁烷(1)。首先,将两个摩尔当量的2和一个摩尔当量的二
氯金属茂Cp 2 MCl 2(3)(M = Ti,Zr,Hf)合并以形成1,3-二格里雅试剂Cp 2 M(CH 2 MgBr)2(4)与二
氯化金属L 2 M'Cl 2(L 2 M'= Cp2 Ti,Cp 2 Zr,Cp 2 Hf,Me 2 Si,Me 2 Ge,Me 2 Sn)得到1。的1 H和13的C NMR光谱1示出有趣的趋势其是简要讨论。