The titled compound 5a reacts with trialkyl phosphites and dialkyl phosphonates to give, in each case, two conformers (A+B) of the corresponding phosphonate 8 and 9. The yields of the two isomers were estimated on the basis of 31P NMR data. Besides, structures 8 and 9 were supported by analytical and spectroscopic measurements of the major isomer 8A and 9A. The rotational isomers were assigned in terms of the Newman projection and NMR data. Relative ratios were studied in the light of dynamic NMR spectroscopy.
标题化合物5a与三烷基
亚磷酸酯和二烷基
膦酸酯反应,分别生成相应
膦酸酯8和9的两个构象(A+B)。根据31P NMR数据,对两种异构体的产率进行了估算。此外,通过主要异构体8A和9A的分析和光谱测量,证实了结构8和9。根据纽曼投影和NMR数据,确定了旋转异构体。根据动态NMR光谱学研究了相对比率。