The structures of methyl 5-deoxy-2,3-O-isopropylidene-5-C-R 3 Sn--D-ribofuranosides 4) and 3-triphenylstannylpropyl 2,3-O-isopropylidene--D-ribofuranoside (5) have been investigated.Much interest has been shown in furanose ring conformations of carbohydrates in solution and the solid state. 1±4 Ribofuranosyl rings, in general, have attracted attention as a consequence of their presence in nucleosides and nucleotides; particularly well studied have been 2,3-unsubstituted b-D-ribofuranosyl derivatives 2±4 and their 2-deoxy analogues. The more rigid 2,3-O-isopropylidene-b-D-ribofuranosyl derivatives 2 have attracted less, but still signi®cant, attention. 9,10 We have investigated the solution structures

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Carbohydrates Carbohydrates U 0500 Hydroxy Group Interactions in Stannylated Carbohydrates. Structures and Thermal Stabilities of 5-Deoxy-5-C-(Ph 3 Sn)-1,2-O-isopropylidene-α-D-xylofuranose, 5-Deoxy-5-C-(IPh 2 Sn)-1,2,O-isopropylidene-α-D-and -L-xylofuranose, and 5-Deoxy-5-C-(I 2 PhSn)-1,2-O-isopropylidene-α-D-and-L-xylofuranose. -(BURNETT, L. A.; FERREIRA, V. F.; HOWIE, R. A.; RUFINO, H.; SKAKLE, J. M. S.; WARDELL, J. L.; WARDELL, S. M. S. V.; J. Chem. Soc., Perkin Trans. 1 2002, 20, 2288-2300; Dep. Chem., Univ. Aberdeen, Aberdeen AB24 3UE, UK; Eng.) -Lindner 06-187

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