fig7
Figure 7. Chiral C2-symmetric urea-catalyzed cyclopropanation of β,γ-unsaturated α-ketoesters. This figure is used with permission from the American Chemical Society[52].
Figure 7. Chiral C2-symmetric urea-catalyzed cyclopropanation of β,γ-unsaturated α-ketoesters. This figure is used with permission from the American Chemical Society[52].
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