Absolute Configuration and Conformational Stability of (+)-2,5-Dimethylthiolane and (−)-2,5-Dimethylsulfolane
作者:Feng Wang、Hao Wang、Prasad L. Polavarapu、Carmelo J. Rizzo
DOI:10.1021/jo0100401
日期:2001.5.1
Enantiopure (+)-2,5-dimethylthiolane and (-)-2,5-dimethylsulfolane were prepared using literature procedures and investigated using vibrational circular dichroism (VCD). Experimental absorption and VCD spectra of (+)-2,5-dimethylthiolane and (-)-2,5-dimethylsulfolane in CCl(4) solution in the 2000-900 cm(-)(1) region were compared with the ab initio predictions of absorption and VCD spectra obtained
使用文献方法制备对映纯(+)-2,5-二甲基硫杂环戊烷和(-)-2,5-二甲基环丁砜,并使用振动圆二色性(VCD)进行研究。在2000-900 cm(-)(1)区域中比较(+)-2,5-二甲基硫杂环戊烷和(-)-2,5-二甲基环丁砜在CCl(4)溶液中的实验吸收和VCD光谱密度泛函理论使用B3LYP / 6-311G(2d,2p)基集针对(2R,5R)-2,5-二甲基硫杂环戊烷和(2R,5R)-2,5的不同构象获得的吸收光谱和VCD光谱预测-二甲基环丁砜。此比较表明(+)-2,5-二甲基硫杂环戊烷具有(2R,5R)-配置,并在CCl(4)解决方案中具有两个主要的构象。另外,(-)-2,5-二甲基环丁砜具有(2R,5R)-构型并且仅具有一个主要的构象。