Research Article

Polyethylene Glycols as Efficient Catalysts for the Oxidation of Xanthine Alkaloids by Ceric Ammonium Nitrate in Acetonitrile: A Kinetic and Mechanistic Approach

Table 4

Activation parameters of hypoxanthine in different PEG media.

Type of PEGPEG % (V/V) at 300 K Equation # # # J/Kmol
kJ/mol

PEG-2000.50.04 0.97675.210394.7
1.00.09 0.97848.379.2103
2.00.11 0.96248.178.7102
3.00.18 0.99834.877.4142
4.00.21 0.96534.477.3143
5.00.02 0.98135.776.8137

PEG-3000.50.14 1.0036.178.1140
1.00.16 0.97236.077.1139
2.00.18 0.99834.977.5142
3.00.21 0.98835.477.1139
4.00.23 0.98233.076.8146
5.00.25 0.97834.476.7141

PEG-4000.50.16 0.97135.877.8140
1.00.18 0.99734.877.7143
2.00.21 0.99732.877.2148
3.00.23 0.99932.977.0147
4.00.25 0.99835.576.6137
5.00.28 0.99832.775.0141

PEG-6000.50.14 0.96324.978.3178
1.00.21 1.0025.077.2174
2.00.25 0.99721.876.7183
3.00.30 0.99520.076.4188
4.00.35 0.97420.876.0184
5.00.42 0.99918.975.3188