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

Table 9

Values of rate constant at different temperatures and activation parameters^a.

5-Oxoacid	10^3(); (s^−1)			(kJ mol^−1)	(J K^−1 mol^−1)	(kJ mol^−1)
	298 K	308 K	318 K
p-OCH3	8.12	15.63	29.23	47.29	−93.03	287.00
p-CH3	4.06	7.82	14.61	40.97	−98.97	305.24
p-C6H5	2.96	5.71	10.67	38.68	−101.08	311.71
–H	2.67	5.14	9.61	36.19	−102.42	315.81
p-Cl	0.82	1.59	2.97	25.27	−111.99	345.18
p-Br	0.42	0.81	1.51	21.06	−117.54	362.23
m-NO2	0.21	0.40	0.75	13.59	−123.48	380.45

^a10³[Perborate]₀ = 1.0 mol dm⁻³; 10²[5-oxoacid]₀ = 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).