Copper(I) complexes with chiral ligands, such as copper(I)-bisoxazoline complexes, are used for enantioselective C-C bond formation. These catalysts are particularly effective in asymmetric allylic substitutions. Copper carbenoids have been employed for intermolecular carbenoid insertion reactions. Copper(I) salts and diazo compounds can be used to generate carbenoids that insert into C-H bonds.
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