[(L-prolinate)Rh(COD)] (0.02 equiv.) was dissolved in chloroform. Subsequently, a diazo-functionalized PCP monomer (1.00 equiv.) dissolved in chloroform was added. The reaction mixture was stirred for at least 14 hours or longer until GC indicated that all starting monomers had been converted. Then the solvent was evaporated under vacuum, and oily residuals were precipitated three times in hexane.