5,6-Dimethyl-3,4-dihydropyran Singlet oxygen

Gollnick, K.; Knutzen-Mies, K.
J. Org. Chem. 56, 4017-4027 (1991)

Reaction: 5,6-Dimethyl-3,4-dihydropyran + ¹O₂^* ® products
Solvent: MeOH

k_react = 7.2 × 10⁷(L mol^-1 s^-1), k_reference = 1.8 × 10⁸(L mol^-1 s^-1), T = 286K

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

Photosensitizer = Rose Bengal dianion; used solvent k_d = 1.4 × 10⁵ s^-1; Actinometer = 2,5-Dimethylfuran; Rate of physical quenching/product formation = £ 0.1; 24% [2+2] cycloaddition. Added solute 0.02. [Sensitizer] = 2-10 × 10^-4 (mol L^-1). [Indicator] = 8-40 × 10^-3 (mol L^-1).