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Angew. Chem. Int. Ed. 2006, 45, 2901-2904. In this preliminary communication, Fehr and Galindo have also synthesized enantiomerically pure precursors I and II and then submitted them to cyclization giving rise to some unexpected results; this prompted them to suggest that Soriano/Marco-Contelles' proposal for the mechanism of the Rautenstrauch cyclopropanation (reference [18]) should be re-considered; their mechanistic proposal has been recently re-analyzed by us (reference [22]).
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