Acta Cryst. (2008). E64, o1012  [ doi:10.1107/S1600536808012567 ]

2-O-Benzhydryl-3,4-(S)-O-benzylidene-D-xylono-1,4-lactone

S. F. Jenkinson, S. D. Rule, K. V. Booth, G. W. J. Fleet, D. J. Watkin and S. Petursson

Abstract: X-ray crystallography unequivocally shows that protection of the free hydroxyl group of 3,5-O-benzylidene-D-xylono-1,4-lactone with diphenyldiazomethane proceeded smoothly to give the title compound, C₂₅H₂₂O₅, with no accompanying epimerization. Unlike the analogously protected lyxono lactone, the isomeric xylono lactone has two molecules present in the asymmetric unit (Z' = 2). The 5-ring lactones adopt envelope conformations and the 6-ring ketals adopt chair conformations.

Online 7 May 2008

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