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

Table 3

Effect of varying solvent composition on the rate of perborate oxidation of 5-oxoacids at 313 ± 0.1 K. {[Substrate] = 0.01 mol dm⁻³; [perborate] = 0.001 mol dm⁻³; [H₂SO₄] = 2.0 mol mol⁻³}.

ACOH-H2O (v/v, %)	10^5×𝑘 (s^−1)^b
	p-OCH3	p-CH3	p-C6H5	−H	p-Cl	p-Br	m-NO2
30 : 70 (53.18)	63.8	9.50	8.67	7.60	2.38	1.97	1.18
40 : 60 (46.48)	115.2	13.10	11.86	9.60	3.10	2.12	1.29
50 : 50 (39.78)	191.8	26.87	18.73	12.80	4.27	3.62	1.50
60 : 40 (33.08)	586	44.70	31.01	15.90	7.20	4.89	1.75
70 : 30 (26.38)	1751	162.9	71.23	38.30	12.80	7.61	2.69

aValues of dielectric constant of the media are given in parentheses; ^bmean of duplicate experiments.