作者:James R. Bull、Jan L.M. Dillen、Mark A. Sefton
DOI:10.1016/s0040-4020(01)81470-8
日期:——
15-tetraen-17-ones provides evidence for conformational deformation of ring C to a twist-boat form in solution. These observations are supported by molecular mechanics (MM2) calculations, which predict that the ring C chair and ring C twist-boat conformers have similar steric energies, slightly favouring the latter. An X-ray crystal structure determination on 3-methoxy-14-methyl-14β-estra-1,3,5(10)
四个3-甲氧基-14β-estra-1,3,5(10),15-tetraen-17-ones的高场nmr分析为溶液中C环构象变形为扭转皿形式提供了证据。这些观察结果得到分子力学(MM2)计算的支持,该计算预测C环椅和C扭曲船构象异构体具有相似的空间能,略微偏向后者。用X射线晶体结构测定3-甲氧基-14-甲基-14β-estra-1,3,5(10),15-丁烯-17-一发现,环C确实在其表面具有扭曲结构。固体状态。