Electronic absorption and circular dichroism spectra of the perturbed coplanar cis-diene chromophore in deuterium- and methyl-substituted 7,7-dimethylbicyclo[4.1.1]octa-2,4-dienes
作者:Alan R. Browne、Francis R. Kearney、Stephen F. Mason、Leo A. Paquette、Alex F. Drake
DOI:10.1021/ja00357a025
日期:1983.9
monodeuterated 7,7-dimethylbicyclo(4.1.1)octa-2,4-dienes have been prepared with known absolute configuration from (+)-nopinone. Access to their methyl congeners has been achieved from (+)-..cap alpha..-pinene and (+)-nopinone, respectively. The chirality is due solely to isotopic substitution. The contributions of the C-D and C-CH/sub 3/ groups to the observed absorption and circular dichroism spectra are analyzed
光学活性单氘化 7,7-二甲基双环 (4.1.1)octa-2,4-diene 已从 (+)-nopinone 以已知的绝对构型制备。分别从 (+)-..cap α..-蒎烯和 (+)-nopinone 获得了它们的甲基同源物。手性仅归因于同位素取代。分析了 CD 和 C-CH/sub 3/ 基团对观察到的吸收光谱和圆二色性光谱的贡献。特别是,注意力集中在平面 cis-1,3-二烯单元上,C/sub 2/-C/sub 3/ 和 C/sub 4/-C/sub 5/ 键之间产生的零二面角平衡,以及这种独特的固定几何形状的后果。