作者:C. Beard、Carl Djerassi、J. Sicher、F. S̆ipos̆、M. Tichý
DOI:10.1016/s0040-4020(01)99347-0
日期:1963.1
Optically active cis- and trans-2-methyl-4-t-butylcyclohexanone have been synthesized and equilibrated in an alkaline medium. The position of the equilibrium, as determined by optical rotatory dispersion or gas chromatographic measurements, agreed well with earlier published data in the racemic series. The optical rotatory dispersion curve of cis-2-methyl-4-butylcyclohexanone, a substance which has
光学活性的顺式和反式-2-甲基-4-叔丁基环己酮已经合成并在碱性介质中达到平衡。通过旋光色散或气相色谱测量确定的平衡位置,与外消旋系列中较早发表的数据非常吻合。顺式-2-甲基-4-丁基环己酮的旋光色散曲线(该物质先前已用于证明不存在“ 2-烷基酮效应”)指向背离普通椅子构象的构象,该构象并未出现这种现象。似乎与庞大的叔丁基取代基有关,但与2,4-双季位取代模式有关,因为顺式化合物遇到类似的结果-2,4-二甲基环己酮。轴向取向的2-甲基环己酮(例如,反式-2,6-二甲基环己酮,反式-2-甲基-4-叔丁基环己酮,2β-和4β-甲基-3-酮- 5α-类固醇)表示差异,最好从构象变形方面进行解释。