addenda and errata
β-arabinopyranosyl)sulfanyl]-4,6-diphenylpyridine-3-carbonitrile. Corrigendum
of racemic 2-[(aPharmaceutical Chemistry Department, Faculty of Pharmacy, Helwan University, Cairo, Egypt, bChemistry Department, Faculty of Science, Helwan University, Cairo, Egypt, and cInstitut für Anorganische und Analytische Chemie, Technische Universität Braunschweig, Hagenring 30, D-38106 Braunschweig, Germany
*Correspondence e-mail: p.jones@tu-bs.de
An error in the interpretation of a reference in the paper by Hammad et al. [Acta Cryst. (2018), E74, 853–856] is corrected.
Keywords: crystal structure; arabinose; pyridine; hydrogen bond.
Our publication with the title given above (Hammad et al., 2018) reported the synthesis and of a racemic arabinose derivative, starting from a D-arabinose derivative. As a reference to of arabinose derivatives, the article by Brands & Davies (2006) was cited. In fact, the article contains no mention of the of arabinose; indeed, colleagues have pointed out that this process is unlikely to occur. We apologise for this error.
There are two possible explanations for the formation of a racemic product. Either the starting D material contained a small amount of the opposite L and a small amount of racemate then crystallized preferentially, or racemic arabinose was initially (and erroneously) employed. Since the samples are no longer available, we have no way to establish which explanation is correct. Arabinose is an exception amongst common sugars in that all three forms (D, L and the racemate DL) are readily available.
This in no way affects the discussion of the structure.
References
Brands, K. M. J. & Davies, A. J. (2006). Chem. Rev. 106, 2711–2733. Web of Science CrossRef PubMed CAS Google Scholar
Hammad, S. F., Masoud, D. M., Elgemeie, G. H. & Jones, P. G. (2018). Acta Cryst. E74, 853–856. Web of Science CSD CrossRef IUCr Journals Google Scholar
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