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(a) Disruption of helicity and inactivation of one Rh-site via His coordination to an adjacent axial position on Rh. (b) Optimized peptide 11.70 for cyclopropanation that was identified form on-bead screening of monomeric Rh-peptide complexes. (c) Asymmetric cyclopropanation of olefins 11.71 with α-diazophenylacetates 11.66 catalyzed by resin-supported tripodal Rh-peptide complex 11.70.492
