Stereoelectronic effects in the conformation and hydrolysis of epimeric(4aα, 8aβ)-hexahydrobenzo-2-(-Nitrophenoxy)-2-Oxo-1,3,2λ5 dioxaphosphorinanes and 4aα-methyl-8aβ-pentahydrobenzo-2- (-Nitrophenoxy) -2- oxo-1, 3,2λ5 -dioxaphosphorinanes
作者:Kazunari Taira、Kofen Lai、David G. Gorenstein
DOI:10.1016/s0040-4020(01)87422-6
日期:1986.1
The epimeric (4aα, 8aβ)-hexahydrobenzo-2-(-nitrophenoxy)-2-oxo- 1,3,2 λ5-dioxaphosphorinanes , (axial and pseudo-equatorial -nitrophenoxy group) and 4aα-methyl-8aβ-pentahydrobenzo-2-(-nitrophenoxy)-2-oxo-1,3,2λ5-dioxaphosphorinanes , (axial and equatorial -nitrophenoxy group) were hydrolyzed in 12% methanol/water. For axial isomers and , the methyl group at the trans-ring junction did not affect the
差向异构(4aα,β)-hexahydrobenzo -2-(硝基苯氧基)-2-氧代-1,3,2-λ 5 -dioxaphosphorinanes ,(轴向和伪赤道硝基苯氧基团)和4aα甲基8aβ-pentahydrobenzo- 2-(硝基苯氧基)-2-氧代- 1,3,2λ 5 -dioxaphosphorinanes ,(轴向和赤道-硝基苯基)在12%甲醇/水进行水解。对于轴向异构体和,反式环连接处的甲基不影响水解速度。赤道异构体的甲基取代,在另一方面,水解率30%相比,减少。对于两种差向异构体,赤道化合物(从椅子构型上看)的水解速度都快于相应的轴向异构体。这些结果与这样的想法是一致的:轴向异构体通过椅子构象反应,而赤道异构体通过扭曲船构象在假轴向位置与leavinq基团反应。