Preparation
3,3-Dimethyl-1-butynylcopper(I) is most conveniently prepared in situ by treatment of 3,3-dimethyl-1-butyne with nButyllithium, followed by addition of Copper(I) Iodide or the Me2S.CuBr complex (see Copper(I) Bromide). 3,3-Dimethyl-1-butynylcopper(I) (1) can be isolated as a solid by addition of 3,3-dimethyl-1- butyne to a premixed solution of Copper(II) Sulfate and Hydroxylamine hydrochloride in aqueous ammonia. The aqueous layer is decanted and the precipitate is extracted with pentane. After workup, (1) is collected upon concentration of the solvent. Alternatively, (1) has been prepared by photoreduction of Copper(II) Acetylacetonate in the presence of 3,3-dimethyl-1-butyne.
