Kinetic Study on Nucleophilic Substitution Reactions of Aryl Diphenylphosphinates with Butane-2,3-dione Monoximate and Aryloxide Anions: Reaction Mechanism and Origin of the α-Effect
作者:Ik-Hwan Um、Jeong-Yoon Han
DOI:10.1002/bkcs.10836
日期:2016.8
A kineticstudy is reported for nucleophilic substitution reactions of X‐substituted‐phenyl diphenylphosphinates (3a–3f) with butane‐2,3‐dione monoximate (Ox−) and a series of Y‐substituted‐phenoxide (Y‐PhO−) ions in 50 mol % H2O/50 mol % DMSO at 25.0 ± 0.1°C. The reactions of 3a–3f with Ox− and 4‐chlorophenoxide (4‐ClPhO−) result in linear Brønsted‐type plots with βlg = −0.70 and −0.64, respectively
Reactions of phosphate and phosphorothiolate diesters with nucleophiles: comparison of transition state structures
作者:Jing-Dong Ye、Christofer D. Barth、Potluri S. R. Anjaneyulu、Thomas Tuschl、Joseph A. Piccirilli
DOI:10.1039/b707205h
日期:——
synthesized and their reactions with pyridine derivatives were compared to those for methyl aryl phosphate esters (OP). Results show that SP esters react with pyridine nucleophiles via a concerted S(N)2(P) mechanism. Bronsted analysis suggests that reactions of both SP and OP esters proceed via transition states with dissociative character. The overall similarity of the transitionstatestructures supports the