observed. The conformational domino effect previously predicted from alkyl beta-(1-->6)-diglucopyranosides is now supported by the conformational properties of their alpha-anomers, the anomeric configuration controlling the domino effect. In addition, the rotational populations around the C5'-C6' bond (torsion angle omega') depend weakly on the structure of the aglycon and the anomeric configuration
合成了一系列烷基β-
D-吡喃葡萄糖基-(1→6)-α-
D-吡喃葡萄糖苷,并通过NMR和CD技术进行了分析。如同在其β-端基异构体系列中一样,糖苷间键(扭转角为ω)中所涉及的羟甲基旋转种群取决于糖苷配基和溶剂。然而,对于该α-端基异构体系列,旋转依赖性直接源自空间效应。观察到烷基取代基的旋转种群与摩尔折射率(MR)空间参数之间的相关性,但与塔夫脱的空间参数(β-端基异构体)之间没有相关性。以前由烷基β-(1-> 6)-二
葡萄糖吡喃糖苷预测的构象多米诺效应现在由其α-端基异构体的构象特性支持,端基异构构型控制多米诺效应。