Synthesis and Structure of Optically Active 1,12-Diethyl- and 1,12-Diisopropylbenzo[<i>c</i>]phenanthrenes: An Isopropyl Group Can Be Smaller than a Methyl Group
作者:Hiroki Sugiura、Daisuke Sakai、Harunori Otani、Kazuhiro Teranishi、Yusuke Takahira、Ryo Amemiya、Masahiko Yamaguchi
DOI:10.1246/cl.2007.72
日期:2007.1
1,12-Diethyl- and 1,12-diisopropylbenzo[c]phenanthrene-5,8-dicarboxylic acids were synthesized, and resolved. The dihedral angles formed by the A and D rings increased in the order of diisopropyl < diethyl < dimethyl as indicated by X-ray analysis, which showed that the strain decreased with the increase of the bulkiness at the 1,12-groups.
合成并解析了 1,12-二乙基和 1,12-二异丙基苯并[c]菲-5,8-二羧酸。X 射线分析表明,A 环和 D 环形成的二面角按照二异丙基 < 二乙基 < 二甲基的顺序增大,这表明应变随着 1,12 基团体积的增大而减小。