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