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

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.

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The following article ‘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, Abhishek Dubey and Anand Harbindu has been published in Organic & Biomolecular Chemistry.

It has been brought to the Executive Editor's attention that there are a number of unexplained discrepancies (visible under magnification) in the NMR spectra presented in the ESI accompanying this article. These have been confirmed by independent review by a member of the Editorial Board.

The affected spectra are: ¹³C NMR spectra for; 11, 13, 17, 20, 15 and 21, ¹H NMR spectra for; 17 and 21.

Following consultation with the authors and the Director of CSIR-National Chemical Laboratory, we have established that archive copies of the original data supporting these spectra are no longer available for comparison. After carrying out an internal review the Director of CSIR-National Chemical Laboratory has determined that there was no intentional altering of the published NMR spectra.

However as the accuracy of these NMR spectra cannot be confirmed the Executive Editor is issuing this notice for readers’ information.

Richard Kelly

20th June 2017

Executive Editor, Organic & Biomolecular Chemistry

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