oxygen rebound as a reductive elimination. The reaction mechanism was studied by high‐level dispersion corrected hybrid functional DFT with implicit solvation. The low‐energy conformational space was searched by the efficient CREST program. The stereoselectivity was deduced from the lowest lying benzylic radical structures and their conformations are controlled by hyperconjugative interactions and steric
此处描述的是
钛茂
金属催化的反应,分别由苄基醚和苄基胺与侧链环氧化合物合成
乙缩醛和
半缩醛。反应通过单电子步骤催化进行。氧化加成包括
环氧化物开口。H原子转移可生成苄基自由基,是自由基易位的步骤,而有机
金属氧的反弹则是还原性的消除。通过高
水平色散校正的含隐溶剂化混合功能DFT研究了反应机理。通过高效的CREST程序搜索低能构象空间。立体选择性由最低的苄基自由基结构推导而来,其构象由
钛茂催化剂与底物的芳基之间的超共轭相互作用和空间相互作用控制。一个有趣的机理方面是苄基中心的氧化在还原条件下发生。