The Rates of Electron Transfer from ClUra and ClUraH^· to p-nitroacetophenone

Summary

Pulse-radiolysis experiments demonstrate that both the radical ion ClUra and the protonated radical ClUraH^· of chlorouracil will transfer electrons to p-nitroacetophenone (PNAP). The reaction of ClUraH^· is complicated by an unknown reaction with PNAP below pH 4·4. Rate constants measured for reactions (2) and (3) are k₂ = 5·3 × 10⁹ and k₃ = 3·3 × 10⁹ M⁻¹ sec⁻¹. An independent determination of the rate-constant for dissociation of the radical ion (equation (1)) was also obtained (k₁ = 0·7 × 10⁵ sec⁻¹).