Selectivity of the cyclopropanation of olefins with ethyl phenyldiazoacetate has been tested using different gold complexes bearing phosphine, phosphite or N-heterocyclic as ligands. A comparative study with related copper and silver complexes as catalysts is also presented.
![Gold-catalyzed olefin cyclopropanation](https://www.iciq.org/wp-content/uploads/2014/03/Gold-catalyzed-olefin_1790.jpg)