A catalyst that couples a photoswitch to the biaryl backbone of a chiral bis(phosphine) ligand, thus allowing photochemical manipulation of ligand geometry without perturbing the electronic structure is reported. The changes in catalyst activity and selectivity upon switching can be attributed to intramolecular mechanical forces, thus laying the foundation for a new class of catalysts whose selectivity
报道了一种将光开关偶联到手性双(膦)
配体的联芳基主链上的催化剂,从而允许对
配体的几何形状进行光
化学操作而不会干扰电子结构。转换时催化剂活性和选择性的变化可归因于分子内的机械力,从而为新型催化剂奠定了基础,其选择性可通过控制催化剂在周转过程中所经历的分子应力而在合适的范围内平稳地就地变化。 。产生的力约为100 pN,因此导致不对称的Heck芳基化和Trost烯丙基烷基化的对映选择性的可测量变化。