Theoretical Elucidation of Kinetic and Thermodynamic Control of Radical Addition Regioselectivity
作者:Andrew G. Leach、Renxiao Wang、G. Erich Wohlhieter、Saeed I. Khan、Michael E. Jung、K. N. Houk
DOI:10.1021/ja029342q
日期:2003.4.1
cyclizations is determined. Kinetic control favors 6-endo cyclization, while thermodynamic control gives 5-exo cyclization, and the observation of different products from different research groups arises from the difference in experimental conditions used by the two groups. The outcome of a new cyclization reaction was predicted by using these theoretical techniques. Kinetic control is predicted to yield exclusively
通过从头算和密度泛函 (UB3LYP/6-31+G**//UHF/6-31G* 和 UB3LYP/6-31G*) 研究了两个结构相似的 2-oxo-5-己烯基型自由基的环化//UB3LYP/6-31G*) 计算。确定了 6-endo 和 5-exo 环化明显矛盾的报告的起源。动力学控制有利于6-内环化,而热力学控制有5-外环化,不同研究组对不同产物的观察源于两组实验条件的差异。使用这些理论技术预测了新的环化反应的结果。预计动力学控制仅产生 6-内环化产物,而热力学控制将导致一种 6-内环化产物和一种 5-外环化产物的大致相等的混合物。