Aryl-2,3-oxaphosphabicyclo[2.2.2]octene derivatives—the precursors of oxoarylphosphine oxides (aryl metaphosphonates)
作者:Stefan Jankowski、György Keglevich、Tomasz Nonas、Henrietta Forintos、Marek Główka、Juliusz Rudziński
DOI:10.1016/j.tet.2004.01.069
日期:2004.3
The Baeyer–Villiger oxidation of 7-phosphanorbornene 7-oxides with sterically demanding substituents on the phosphorus atom (4a–d) by m-chloroperbenzoic acid afforded the title products (5a–d) as a mixture of two regioisomers (A and B). Isomer A, the result of thermodynamic control, was stable, while isomer B, the product of kinetic control, underwent decomposition and/or epoxidation. Single crystal
7- phosphanorbornene -7-氧化物的拜尔-维利格氧化,在磷原子空间要求的取代基(4A - d)由米氯过苯甲酸,得到标题产物(5A - d),为两种区域异构体的混合物(阿和乙) 。热力学控制的结果异构体A是稳定的,而动力学控制的产物异构体B则发生分解和/或环氧化。的单晶X射线分析P - (2,4,6-三异丙基)oxaphosphabicyclooctene(5AC)不仅可用于评估其结构,而且在文献中首次可检测到X射线辐照碎裂形成的低配位芳基偏膦酸酯(15c)。前体(5Aa - c)用于醇的热诱导和紫外光介导的断裂相关磷酸化。除了通过间膦酸酯中间体(15)的众所周知的消除-加成机理外,还证实了涉及具有五价五配位磷原子的物种(16)的新颖的消除成膜途径。