Correction and removal of expression of concern: Enantio- and diastereocontrolled conversion of chiral epoxides to trans-cyclopropane carboxylates: application to the synthesis of cascarillic acid, grenadamide and L-(−)-CCG-II

Abstract

Correction and removal of expression of concern for ‘Enantio- and diastereocontrolled conversion of chiral epoxides to trans-cyclopropane carboxylates: application to the synthesis of cascarillic acid, grenadamide and L-(−)-CCG-II’ by Pradeep Kumar et al., Org. Biomol. Chem., 2012, 10, 6987–6994, DOI: 10.1039/C2OB25622C.

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The ¹H NMR and ¹³C NMR spectra of a number of compounds, presented in the original supporting information for this article, were inappropriately doctored to remove peaks corresponding to impurities. Replacement spectra have been provided in the revised supporting information for:

¹³C NMR: 3b, 11, 13, 17, 20, 15, 21 and 14

¹H NMR: 3a, 3b, 13, 17, 15, 21

DEPT: 14

For compounds 3a, 14, 17 and 20, the authors were able to identify raw NMR FID files for the title compounds. For compounds 3b, 11, 13, 15 and 21, the authors resynthesized the compounds and new NMR spectra were generated as the original data were no longer available.

The validity of the replacement spectra in the revised ESI and raw FID NMR files have been reviewed by an expert in comparison to the originally published spectra. The expert confirmed that the replacement spectra match the raw data and have not been doctored. While some of the compounds do contain impurities, the amount does not affect the main substance or conclusions of the paper.

This correction supersedes the information provided in the Expression of Concern related to this article.

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