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Spannung im Ring: Zwei neue Cyclopropanierungsreaktionen (siehe Schema; LA=Lewis‐Säure, Nu=Nucleophil) verlaufen mit hoher Stereoselektivität unter erstaunlich milden Bedingungen. In der ersten sind Epoxide die Methylenquelle in der Synthese enantiomerenangereicherter Cyclopropane. In der zweiten wird der Anwendungsbereich der etablierten allylischen Alkylierungen hin zur Synthese dreigliedriger Ringe...
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