Advances in Physical Chemistry / 2013 / Article / Tab 4 / 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 PEG PEG % (V/V)
at 300 K
Equation
#
#
# J/KmolkJ/mol PEG-200 0.5 0.04
0.976 75.2 103 94.7 1.0 0.09
0.978 48.3 79.2 103 2.0 0.11
0.962 48.1 78.7 102 3.0 0.18
0.998 34.8 77.4 142 4.0 0.21
0.965 34.4 77.3 143 5.0 0.02
0.981 35.7 76.8 137 PEG-300 0.5 0.14
1.00 36.1 78.1 140 1.0 0.16
0.972 36.0 77.1 139 2.0 0.18
0.998 34.9 77.5 142 3.0 0.21
0.988 35.4 77.1 139 4.0 0.23
0.982 33.0 76.8 146 5.0 0.25
0.978 34.4 76.7 141 PEG-400 0.5 0.16
0.971 35.8 77.8 140 1.0 0.18
0.997 34.8 77.7 143 2.0 0.21
0.997 32.8 77.2 148 3.0 0.23
0.999 32.9 77.0 147 4.0 0.25
0.998 35.5 76.6 137 5.0 0.28
0.998 32.7 75.0 141 PEG-600 0.5 0.14
0.963 24.9 78.3 178 1.0 0.21
1.00 25.0 77.2 174 2.0 0.25
0.997 21.8 76.7 183 3.0 0.30
0.995 20.0 76.4 188 4.0 0.35
0.974 20.8 76.0 184 5.0 0.42
0.999 18.9 75.3 188