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Concellón, José M.; Rodríguez-Solla, Humberto; Méjica, Carmen; Blanco, Elena G. . (2007). Stereospecific Cyclopropanation of Highly Substituted C−C Double Bonds Promoted by CrCl <sub/>2</sub> . Stereoselective Synthesis of Cyclopropanecarboxamides and Cyclopropyl Ketones. Organic Letters, 9(16), 2981–2984. doi:10.1021/ol070896d 
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