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首页> 外文期刊>Acta Crystallographica, Section B. Structural Science >Structures of furanosides: geometrical analysis of low-temperature X-ray and neutron crystal structures of five crystalline methyl pentofuranosides
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Structures of furanosides: geometrical analysis of low-temperature X-ray and neutron crystal structures of five crystalline methyl pentofuranosides

机译：呋喃糖苷的结构：五个结晶甲基戊呋喃糖苷的低温X射线和中子晶体结构的几何分析

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摘要

Crystal structures of all five crystalline methyl D-pentofuranosides, methyl alpha -D-arabinofuranoside (1), methyl beta -D-arabinofuranoside (2), methyl alpha -D-lyxofuranoside (3), methyl beta -D-ribofuranoside (4) and methyl alpha -D-xylofuranoside (5) have been determined by means of cryogenic X-ray and neutron crystallography. The neutron diffraction experiments provide accurate. unbiased H-atom positions which are especially important because of the critical role of hydrogen bonding in these systems. This paper summarizes the geometrical and conformational parameters of the structures of all five crystalline methyl pentofuranosides, several of them reported here for the first time. The methyl pentofuranoside structures are compared with the structures of the five crystalline methyl hexopyranosides for which accurate X-ray and neutron structures have been determined. Unlike the methyl hexopyranosides, which crystallize exclusively in the C-1 chair conformation, the five crystalline methyl pentofuranosides represent a very wide range of ring conformations. [References: 36]
机译：所有五种结晶甲基D-戊呋喃糖苷，甲基α-D-阿拉伯呋喃糖苷（1），甲基β-D-阿拉伯呋喃糖苷（2），甲基α-D-呋喃呋喃糖苷（3），甲基β-D-呋喃呋喃糖苷（4）的晶体结构甲基α-D-木呋喃糖苷（5）已经通过低温X射线和中子晶体学测定。中子衍射实验提供了准确的结果。由于氢键在这些系统中的关键作用，H原子的无偏位尤其重要。本文总结了所有五个结晶甲基呋喃呋喃糖苷结构的几何和构象参数，其中一些是首次报道。将甲基呋喃呋喃糖苷结构与五种结晶甲基六吡喃糖苷的结构进行了比较，已确定了它们的精确X射线和中子结构。与仅以C-1椅构象结晶的甲基六吡喃糖苷不同，五种结晶的甲基呋喃呋喃糖苷代表非常广泛的环构象。 [参考：36]

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