Catalytic cleavage of <i>p</i>-nitrophenyl diphenyl phosphinate by hydroxamate ions

1825-1830The reaction of p-nitrophenyl diphenyl phosphinate with two N-substituted hydroxamic acids (N-phenylbenzohydroxamic acid and N-methyl 2-chlorobcnzohydroxamic acid) in three different cationic surfactants (cetyltrimethylammonium bromide, cetyltriphenylphosphonium bromide and cetyldimethylethanolammon ium bromide) at pH 9.1 (27°C) have been studied. The pseudo- first order rate constant increases with surfactant concentration. The pseudophase model has been applied to rate data to explain the behavior of binding of the substrate and nucleophiles