been carried out by X‐ray, NMR, and chemical conversions. The NMR spectra of the isoxazolidines at low temperatures indicated the presence of either a single or a predominant invertomer. The stereochemistry of the invertomers and nitrogen inversion barriers are determined using complete line‐shape analysis and their dependence on solvent is discussed. Copyright © 2008 John Wiley & Sons, Ltd.
研究了几种单和双取代烯烃与(-)去氧
麻黄碱衍生的亚甲基硝基的环加成反应中的非对映选择性。对加成产物(即
异恶唑烷)的立体
化学分析已通过X射线,NMR和
化学转化进行。
异恶唑烷在低温下的NMR谱表明存在单个或主要的反相异构体。使用完整的线形分析确定了反相器和氮转化屏障的立体
化学,并讨论了它们对溶剂的依赖性。版权所有©2008 John Wiley&Sons,Ltd.