Perborate Oxidation of Substituted 5-Oxoacids in Aqueous Acetic Acid Medium: A Kinetic and Mechanistic Study

Table 4

Effect of substituent on the rate of oxidation of 5-oxoacids by perborate at 313 ± 0.1 K. {[Substrate] = 0.01 mol dm⁻³; [perborate] = 0.001 mol dm⁻³; [H₂SO₄] = 2.0 mol mol⁻³; HOAC-H₂O = 1 : 1% v/v}.

Substituent	𝜎	𝜎^+	10^5×𝑘 (s^−1)	5 + log k
p-OCH3	−0.27	−0.78	191.8	2.2829
p-CH3	−0.17	−0.31	26.9	1.4293
p-C6H5	−0.11	−0.22	18.8	1.2623
−H	0.00	0.00	12.8	1.1070
p-Cl	0.23	0.11	4.3	0.6299
p-Br	0.43	0.38	2.7	0.3470
m-NO2	0.71	0.67	1.5	0.1802