An experimental/theoretical approach to determine the optical purity and the absolute configuration of endo- and exo-norborn-5-en-2-ol using mandelate derivatives
作者:Pablo L. Pisano、Ariel M. Sarotti、Silvina C. Pellegrinet
DOI:10.1016/j.tetlet.2009.08.056
日期:2009.11
O-acetylmandelates and mandelates of endo- and exo-norborn-5-en-2-ol were prepared, both as a mixture and also as separate diastereomers. 1H NMR spectroscopy of these derivatives was efficiently used to determine the enantiomeric ratios and to predict the absolute configuration of the alcohols. Theoretical calculations were performed to locate the predominant conformations of the mandelate derivatives and GIAO 1H
制备了内-和外-降冰片烯5-en-2-ol的O-乙酰扁桃酸酯和扁桃酸酯,既是混合物,又是分开的非对映异构体。这些衍生物的1 H NMR光谱被有效地用于确定对映体比率和预测醇的绝对构型。进行理论计算来定位扁桃酸盐衍生物和主要构象GIAO 1 1 H NMR玻尔兹曼加权平均化学位移计算,正确地进行再生试验δ和Δ δ值。