Treatment of 3 equivalents of CuBr with LiMes* (Mes* = C6H2But3-2,4,6) in Et2O at ca. –78 °C afforded, upon treatment with SMe2, the organocopper–copper halide complex [CuMes*{Cu2Br2(SMe2)3}] 1 which has the previously unobserved CuR∶CuX ratio of 1∶2; it is a very rare example of a structurally characterized CuR∶CuX complex without chelating R groups.
C. Hwang, M. M. Olmstead, X. He and P. P. Power, J. Chem. Soc., Dalton Trans., 1998, 2599 DOI: 10.1039/A805108I
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