Ruthenium(III) Catalysis in Perborate Oxidation of 5-Oxoacids

Table 1

Pseudo-first order rate constant for perborate oxidation of substituted 5-oxo acids in presence of ruthenium(III)^a.

5-Oxoacid	10^3; (s^−1)
	10^3[Perborate; (mol dm^−3)
	0.5	1.0	2.0	3.0	4.0
p-OCH3	22.90	24.27	23.29	22.75	25.27
p-CH3	11.45	12.14	11.65	11.38	12.64
p-C6H5	8.34	8.86	8.50	8.30	9.22
–H	7.53	7.98	7.66	7.48	8.31
p-Cl	2.32	2.46	2.36	2.31	2.57
p-Br	1.19	1.26	1.21	1.18	1.31
m-NO2	0.59	0.63	0.60	0.57	0.65

^a10²[5-Oxoacid = 4.0 mol dm⁻³; 10²[H⁺ = 9.88 mol dm⁻³; *10⁴[Ru(III)] = 1.0 mol dm⁻³; HOAc-H₂O = 1 : 1% (v/v); temp. = 308 K.