4-Hydroxy-5,6-dimethyl-2-(dimethylamino)pyrimidine Singlet oxygen

Dixon, S.R.; Wells, C.H.J.
Pestic. Sci. 14, 444-448 (1983)

Reaction: 4-Hydroxy-5,6-dimethyl-2-(dimethylamino)pyrimidine + ¹O₂^* ® products and/or physical quenching
Solvent: H₂O

k = 4.3 × 10⁷(L mol^-1 s^-1), pH = 4.0
k = 8 × 10⁷(L mol^-1 s^-1), pH = 7.0
k = 1.4 × 10⁸(L mol^-1 s^-1), pH = 9.0

Experimental method: Photolysis
Analytical method: oxygen consumption
Data type: Derived from steady state measurements

Photosensitizer = Rose Bengal dianion; used solvent k_d = 5 × 10⁵ s^-1.

Dixon, S.R.; Wells, C.H.J.
Pestic. Sci. 14, 444-448 (1983)

Reaction: 4-Hydroxy-5,6-dimethyl-2-(dimethylamino)pyrimidine + ¹O₂^* ® products and/or physical quenching
Solvent: H₂O

Activation energy = 72(kJ mol^-1), Log(A) = 20.646, Entropy of activation = 150(J K^-1 mol^-1), Temperature range 279 to 296 K
k = 1.5 × 10⁷(L mol^-1 s^-1), T = 279K
k = 2.9 × 10⁷(L mol^-1 s^-1), T = 285K
k = 4.5 × 10⁷(L mol^-1 s^-1), T = 289K
k = 9.0 × 10⁷(L mol^-1 s^-1), T = 296K

Experimental method: Photolysis
Analytical method: oxygen consumption
Data type: Derived from steady state measurements

Photosensitizer = Rose Bengal dianion; used solvent k_d = 5 × 10⁵ s^-1.

Harkness, G.J.; Wells, C.H.J.
Pestic. Sci. 12, 215-218 (1981)

Reaction: 4-Hydroxy-5,6-dimethyl-2-(dimethylamino)pyrimidine + ¹O₂^* ® products and/or physical quenching
Solvent: CHCl₃

k = 1.1 × 10⁷(L mol^-1 s^-1)

Experimental method: Photolysis
Analytical method: vis-UV absorption
Data type: Derived from steady state measurements using indicator

Photosensitizer = Indicator = Rubrene; used solvent k_d = 1.7 × 10⁴ s^-1; k for indicator = 5.3 × 10⁷ L/(mol·s).