(Z)-2-Butene Singlet oxygen

Orfanopoulos, M.; Smonou, I.; Foote, C.S.
J. Am. Chem. Soc. 112, 3607-3614 (1990)

Reaction: CH₃CH=CHCH₃ + ¹O₂^* ® products
Reference Reaction: (E)-2-Butene + ¹O₂^* ®
Solvent: Freon 11

k/k_reference = 18
T = 193K

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

Photosensitizer = Mesoporphyrin IX, dimethyl ester. Meas. k/k_ref = 18. Added solute 0.76.

Hurst, J.R.; Wilson, S.L.; Schuster, G.B.
Tetrahedron 41, 2191-2197 (1985)

Reaction: CH₃CH=CHCH₃ + ¹O₂^* ® products and/or physical quenching
Solvent: CS₂

Enthalpy of activation = 7(kJ mol^-1), Entropy of activation = -134(J K^-1 mol^-1)
k = 4.8 × 10⁴(L mol^-1 s^-1), T = 298K

Experimental method: Flash photolysis
Analytical method: infrared luminescence
Data type: Absolute value measured directly
Excitation wavelength: 532 nm

Photosensitizer = 5,10,15,20-Tetraphenylporphine. Studied at 183-310 K.

Bortolus, P.; Dellonte, S.; Beggiato, G.; Corio, W.
Eur. Polym. J. 13, 185-188 (1977)

Reaction: CH₃CH=CHCH₃ + ¹O₂^* ® products and/or physical quenching
Solvent: CCl₄, 96%, MeOH, 4%

k = 6 × 10³(L mol^-1 s^-1)

Experimental method: Flash photolysis
Analytical method: vis-UV absorption
Data type: Absolute value measured directly using indicator

Photosensitizer = Methylene Blue; Indicator = 1,3-Diphenylisobenzofuran.