Synthesis
Copper halides react with organolithium reagents to form the organocopper compound. Phenylcopper is prepared by reaction of phenyllithium with copper(I) bromide in diethyl ether. Reaction with a second equivalent of R-Li to R-Cu then gives the lithium diorganocopper compound. Copper halides also react with Grignard reagents. The compound pentamesitylpentacopper is prepared from mesityl magnesium bromide and copper(I) chloride. Copper salts add to terminal alkynes to form copper acetylides The copper metallocene (η-cyclopentadienyl triethylphosphine) copper can be prepared by reaction of copper(II) oxide with cyclopentadiene and triethylphosphine in pentane at reflux.
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