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(a) Asymmetric Si–H insertion reaction of α-diazoacetates 11.62 with dimethylphenylsilane catalyzed by helical Rh-peptide complexes. (b) A comparison of the performance of monomeric Rh-peptide 11.64a, parallel dimeric complex 11.64b, and anti-parallel dimer 11.64c in the reaction of 11.62 with dimethylphenylsilane. (c) Peptide 11.65 was ultimately identified as the lead catalyst.489
