Syn and anti conformers in similar proportions were observed at ambient temperature for the title compounds. The conformational assignment of the two anthrones was obtained by the observation of different multiplicity of the methylene NMR signals, whereas that of the anthraquinone derivative was determined by NOE experiments. The anti-to-syn interconversion barriers were obtained by line-shape simulation
在环境温度下观察到标题化合物的顺式和反式构象体比例相似。通过观察亚甲基NMR信号的不同多重性获得了两个
蒽酮的构象分配,而通过NOE实验确定了
蒽醌衍
生物的构象分配。通过温度依赖的NMR谱线的线形模拟和饱和转移实验,获得了反合成互变的势垒。在一种情况下,X射线衍射表明syn是晶体中唯一观察到的结构。