Conformational Analysis of Open-Chain 1,2:3,4-Diepoxides: Comparison of crystal structures, NMR data, and molecular-orbital calculations
作者:Daniel Bur、Martin Nikles、Urs Séquin、Markus Neuburger、Margareta Zehnder
DOI:10.1002/hlca.19930760506
日期:1993.8.11
solid-state conformations of eight out of the nine open-chain 1,2:3,4-diepoxides, whose crystal structures had been determined, correspond to minima on the calculated energy profiles for these compounds or for closely related derivatives. In solution, highly substituted diepoxides of the erythro-series (e-6, e-7, e-9) seem to prefer the same conformation as in the crystal. The solution conformations of all
制备了几对具有不同取代模式的非对映异构开链1,2:3,4-二环氧化合物(参见3-9)。尽可能确定晶体结构,以证实其相对构型并深入了解这些化合物的固态构象。与我们先前的分子轨道计算和1 H-NMR测量结果的比较表明,九种开链的1,2:3,4-二环氧化合物中八种的固态构象已确定,它们的晶体结构已确定最小化这些化合物或紧密相关的衍生物的计算出的能量分布。在溶液中,为高取代度的赤型系列的二环氧化物(e - 6,e - 7,e - 9)似乎更喜欢与晶体相同的构象。所有其他二环氧化物的溶液构型与固态排列方式不同。