one stilbene-derived base. Solid-state structures obtained by X-ray crystal structure analysis confirmed efficient blocking of the active site in the E isomer representing the OFF-states, whereas a freely accessible active site was revealed for a representative Z isomer in the crystal. To correlate structure with reactivity of the catalysts, conformational dynamics were thoroughly studied in solution
哌啶的 Brønsted 碱性的光控制是通过掺入庞大的
偶氮苯基团实现的,并且可以转化为一般碱催化中 ON 和 OFF 状态之间显着的反应性差异。这使得催化剂在硝基醛醇反应(亨利反应)中的活性能够成功地进行光调制。开发了一种光开关催化剂的模块化合成路线,可用于制备和表征三种
偶氮苯衍生的碱和一种
芪衍生的碱。通过 X 射线晶体结构分析获得的固态结构证实了代表 OFF 状态的 E 异构体中的活性位点的有效阻断,而晶体中具有代表性的 Z 异构体显示了一个可自由访问的活性位点。为了将结构与催化剂的反应性相关联,