2 research outputs found
Phenol-amide chelates of cobalt(II), nickel(II), copper(II) and zinc(II) as catalysts for hydrolysis of active esters. Part II<sup>a</sup>. Kinetics and mechanism of hydrolysis of 4-nitrophenylacetate by the metal(II) chelates of 1,2-bis(2-hydroxybenzamido)ethane and 1 ,3-bis(2-hydroxybenzamido)propane
1228-1232The hydrolysis of 4-nitrophenyl acetate
(PNPA) has been studied using mononuclear chelates (ML) of cobalt (II), nickel(II),
copper(II) and zinc(II) with 1,2-bis(2-hydroxybenzamido)ethane( L1)
and 1,3-bis(2-hydroxybenzamido)-propane(L2) at 26.5± 0.2°C, 1=0.5
mol dm-3, 8.1≤ pH ≤ 9.4
(tris buffer), 0.25 ≤103[ML]T/mol dm-3
≤3.0.and
35.0% MeOH + water. The ionized species [M(L-H)]- (due to metal ion promoted
amide deprotonation) are found to be reactive species for catalysis of PNPA
hydrolysis