Phosphoryl transfer from phenyl and 4-nitrophenyl phosphates in aprotic and protic solvents
作者:Fausto Ramirez、James F. Marecek
DOI:10.1016/0040-4020(80)80159-1
日期:1980.1
The behavior of 4-nitrophenyl dihydrogen phosphate, ArOPO3H2, and of its tetra-n-butylammonium and tetramethylammonium salts, ArOPO3H−R4N+, ArOPO32−2(R4N+), was studied in aprotic solvents, in the absence and in the presence of increasing amounts of alcohols or water. The reactions were investigated in the absence of amines, and in the presence of hindered and unhindered amines, diisopropylethylamine
研究了4-硝基苯基磷酸二氢盐ArOPO 3 H 2及其四正丁基铵盐和四甲基铵盐ArOPO 3 H - R 4 N +,ArOPO 3 2-2(R 4 N +)的行为。非质子传递溶剂,在不存在或存在越来越多的醇或水的情况下。在没有胺的情况下,在有受阻和不受阻碍的胺,二异丙基乙胺和奎尼丁的存在下研究了反应。反应过程在35°或70°时遵循31 P和11 H NMR光谱法。根据反应物信号强度等于产物信号强度的时间,估计大约一半反应时间的值(±25%)。所述mononitrophenyl酯转移其磷酰基为醇和水从通过经由oxyphosphorane中间体加成-消除机构的双质子酸,和从一价阴离子和二价阴离子通过消除加成机理经由单体偏中间,PO 3 - 。PO的形成3 -更快从二价阴离子比从在乙腈单价阴离子和醇溶液。相反,PO 3 -在水溶液中,单阴离子的产生速率比二价阴离子的产生速率快。从地层中的PO的速率的降低这样的效果的结果3