and the enantiomers of methyl β-hydroxyisobutyrate. The specific rotations of our samples were [α]D±91.0-93.5° (CHCl3), while the reported values of the samples prepared by resolution or asymmetric synthesis were ±64.5–65.6°.
(2R,5S)-2-甲基-5-
己内酯及其对映体以(S)-
乳酸乙酯和β-羟基
异丁酸甲酯的对映体为原料,以高光学纯度(⩾98-99%ee)合成。我们样品的比旋光度为[α] D ±91.0-93.5°(CHCl 3),而通过拆分或不对称合成制备的样品的报告值为±64.5–65.6°。