The X-ray structure of 1,2:3,4-di-O-isopropylidene-5-O-chloroacetyl-α-D-glucoseptanose shows that the seven-membered septanose ring adopts a conformation which lies between the chair and twist-chair forms.
J. Jackobs and M. Sandaralingam, J. Chem. Soc. D, 1970, 157b DOI: 10.1039/C2970000157B
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