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X-Ray structure of methyl 3,6-anhydro-β-l-gulofuranoside by Jürgen Kopf; Peter Köll; George M. Sheldrick is a Biochemistry, Genetics and Molecular Biology article available to read on EtoBox.

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In a previous study, we published five crystal structures of the eight possible isomers of methyl 3,&nhydrohexofuranosides1. Of special interest was how the anomeric effect\* could dominate the shape and pucker of otherwise highly flexible furanoid rings in these compounds. In accordance with previous 'H-n.m.r. investigations in solution j, the results showed that the conformations of the furanoid rings correspond to an almost quasi-axial orientation of the aglycon and that the driving force is the abovementioned stereoelectronic effect. In all cases, the-influence of the exo-anomeric effect was also observed'. Since the quality of the crystals of a sixth isomer, namely, the title compound 1, was relatively poor, it was at first not possible to determine the crystal structure of this compound. Late+, with the help of the computer programme SHELXS-845, the phase problem was solved by using direct methods and the least-squares method for refinementl. We now report the results of this structure determination. Methyl 3,6-anhydr+L-gulofuranoside3 (1) crystakes in the monoclinic space group P2, with two independent molecules in the asymmetric unit. Furrher crystallographic information is

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Author

Jürgen Kopf; Peter Köll; George M. Sheldrick

Publisher

Elsevier Science; Elsevier ; Elsevier Ltd.; Elsevier BV (ISSN 0008-6215)

Published

1987

Language

EN

Field

Biochemistry, Genetics and Molecular Biology (Life Sciences)