Photoactive Phanes, II. – X-ray Structure and Photoreactivity ofpseudo-gem Cinnamophane Dicarboxylic Acid {bis-4,15-(2′-Hydroxycarbonylvinyl)[2.2]paracyclophane}
作者:Ulrich Meyer、Nacer Lahrahar、Pierre Marsau、Henning Hopf、Helmut Greiving、Jean-Pierre Desvergne、Henri Bouas-Laurent
DOI:10.1002/jlac.199719970215
日期:1997.2
The pseudo-gem cinnamophane dicarboxylic acid 1 was shown to undergo a stereospecific [2 + 2] photocycloaddition in the solid state, generating the truxinic acid derivative 2 in 100% chemical yield; the reaction can proceed to completion because it is not an “independent site” solid state reaction. The X-ray structure of 1 reveals that its molecules are associated in dimers formed from four almost
所述伪-gem cinnamophane二羧酸1被示出经过立体特异性[2 + 2]光环在固体状态中,生成truxinic酸衍生物2在100%的化学产率; 该反应可以进行至完全,因为它不是“独立位点”的固态反应。的X射线结构1揭示了它的分子在从四个几乎线性氢键形成二聚体相关联。一个显着的特征是反应中的双键之间的分子内中心到中心的距离约为3.37Å,这是迄今为止已知的最小距离。与反式相反-肉桂酸,拓扑化学[2 + 2]光环加成反应也发生在溶液中,化学定量产量和量子产率约为0.55(在甲醇中)。