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Optical yields of up to 97% ee characterize the cyclopropanation of olefins with diazoacetates in the presence of the semicorrin complex CuL2 (R = CMe2OH). The chiral, C2-symmetrical semicorrin ligands LH are readily accessible in optically pure form from pyroglutamic acid as starting material.
Fritschi et al. (1986) studied this question.
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