Table 1 Observed rate constants and kinetic parameters of the processes 1 \(\rightarrow\) 5 and 2 \(\rightarrow\) 6 at different pH; \(^{a)}\) values calculated at \(30\, ^\circ \hbox {C}\).
From: Kinetic investigations of sulfite addition to flavanols
Process | T (\(^\circ \hbox {C}\)) | \(k_{obs}\) (day\(^{-1}\)) | E\(_A\) (kJ/mol) | \(\Delta H^\ddagger\) (kJ/mol) | \({}^{\mathrm{a}} \Delta {S}^{\ddagger}\) [kJ/(mol K)] | \({}^{\mathrm{a}} \Delta {G}^{\ddagger}\) (kJ/mol) |
|---|---|---|---|---|---|---|
1 \(\rightarrow\) 5 (pH = 3) | 23 | \((4.9 \pm 0.3) \times 10^{-4}\) | 51.1 ± 3.7 | 48.5 ± 3.7 | \(-0.238 \pm 0.012\) | 120.8 ± 5.2 |
30 | \((8.9 \pm 0.4) \times 10^{-4}\) | |||||
40 | \((18.0 \pm 0.3) \times 10^{-4}\) | |||||
50 | \((29.1 \pm 0.5) \times 10^{-4}\) | |||||
60 | \((50.5 \pm 2.7) \times 10^{-4}\) | |||||
1 \(\rightarrow\) 5(pH = 4) | 23 | \((7.4 \pm 0.5) \times 10^{-4}\) | 41.7 ± 5.0 | 39.1 ± 5.1 | \(-0.266 \pm 0.016\) | 119.9 ± 7.1 |
30 | \((13.1 \pm 0.7) \times 10^{-4}\) | |||||
40 | \((21.9 \pm 1.9) \times 10^{-4}\) | |||||
50 | \((36.9 \pm 1.0) \times 10^{-4}\) | |||||
60 | \((48.4 \pm 1.6) \times 10^{-4}\) | |||||
2 \(\rightarrow\) 6 (pH = 3) | 23 | \((2.2 \pm 0.1) \times 10^{-4}\) | 54.0 ± 3.7 | 51.4 ± 3.7 | \(-0.236 \pm 0.012\) | 122.8 ± 5.2 |
30 | \((3.7 \pm 0.1) \times 10^{-4}\) | |||||
40 | \((8.2 \pm 0.2) \times 10^{-4}\) | |||||
50 | \((15.6 \pm 0.4) \times 10^{-4}\) | |||||
60 | \((24.2 \pm 0.4) \times 10^{-4}\) | |||||
2 \(\rightarrow\) 6 (pH = 4) | 23 | \((2.0 \pm 0.1) \times 10^{-4}\) | 49.7 ± 5.1 | 47.1 ± 5.2 | \(-0.250 \pm 0.017\) | 123.0 ± 7.2 |
30 | \((3.5 \pm 0.2) \times 10^{-4}\) | |||||
40 | \((7.3 \pm 0.3) \times 10^{-4}\) | |||||
50 | \((12.8 \pm 0.1) \times 10^{-4}\) | |||||
60 | \((18.3 \pm 0.4) \times 10^{-4}\) |
