5‐dioxadiazines) has been carried out by NMR spectroscopy. The NMR spectra of the dimers at lower temperatures indicated the presence of either a single or two invertomer(s). The nitrogen inversion barriers are determined using complete line–shape analysis. The invertomer ratios have been used to estimate the relative energies associated with the cis and trans ring fusion in these tricycles. A mechanistic rationale
研究了几种六元环硝酮在环二聚反应中的立体选择性。二聚体(即过氢双
吡啶并[1,2-b; 1'2'-e] -1,4,2,5-二恶二嗪类)的构型/构象分析已通过NMR光谱法进行。较低温度下二聚体的NMR谱表明存在单个或两个内交体。使用完整的线形分析确定氮转化障碍。在这些三轮车中,使用了Invertomer比率来估计与顺式和反式环融合相关的相对能量。提出了二聚化过程中观察到的立体
化学的机械原理。版权所有©2009 John Wiley&Sons,Ltd.