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X-ray and conformational investigation of 6-deoxy-6-C-(1,5-di-O-acetyl-2,3-O-isopropylidene-β-d-allo-pentofuranos-5-yl)-1,2:3,4-di-O-isopropylidene- α-d-galactopyranose and 6-C-(benzyl 5-deoxy-2,3-O-isopropylidene-β-d-ribofuranosid-5-yl)-1,2:3,4-di-O-isopropylidene- d-glycero-α-d-galacto-hexopyranose

✍ Scribed by Janusz W. Krajewski; Wojciech Karpiesiuk; Anna Banaszek

Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
523 KB
Volume
257
Category
Article
ISSN
0008-6215

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✦ Synopsis

The structures of the title compounds (2b and 3) have been investigated in the solid state by X-ray methods. The crystals of 2b are monoclinic, space group P2,, and of 3 orthorhombit, space grtup P2,2,2,.

The cell dimensions are: for 2b, a = 9.910(2), b = 11;745W, c = 11.810(3) A, /3 = 97.32(l)"; and for 3, a = 6.10301, b = 15.954(l), c = 28.855(3) A. Both structures were solved by direct methods, and refined by a full-matrix, least-squares procedure giving for 2b, R = 0.0541 (unit weight), and for 3, R = 0.0451 (R, = 0.0445). The galactopyranose rings of 2b and 3 adopted a twist and a mixed twist-screw conformation, respectively. The absolute configuration at C-7 in 2b, as well as at C-6 in 3, was determined to be (R). Relatively strong intermolecular hydrogen bonds were observed in the crystal structure of 3.

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