3,4,5,6,7,8-Hexahydro-1-benzopyran-2-one Singlet oxygen

Wilson, S.L.; Schuster, G.B.
J. Org. Chem. 51, 2056-2060 (1986)

Reaction: 3,4,5,6,7,8-Hexahydro-1-benzopyran-2-one + ¹O₂^* ® products
Reference Reaction: 2-Methyl-2-pentene + ¹O₂^* ®
Solvent: CD₃COCD₃

Enthalpy of activation = 4.6(kJ mol^-1), Entropy of activation = -130(J K^-1 mol^-1)
k_react = 1.0 × 10⁶(L mol^-1 s^-1), k_reference = 8.1 × 10⁵(L mol^-1 s^-1), T = 296K
k_react = 5.5 × 10⁵(L mol^-1 s^-1), T = 241K

Experimental method: Photolysis
Analytical method: gas chromatography
Data type: Relative value measured by steady state method

Photosensitizer = Methylene Blue.

Wilson, S.L.; Schuster, G.B.
J. Org. Chem. 51, 2056-2060 (1986)

Reaction: 3,4,5,6,7,8-Hexahydro-1-benzopyran-2-one + ¹O₂^* ® products and/or physical quenching
Solvent: CD₃COCD₃

k = 1.1 × 10⁶(L mol^-1 s^-1), T = 296K

Experimental method: Flash photolysis
Analytical method: infrared luminescence
Data type: Absolute value measured directly

Photosensitizer = Methylene Blue.