Flash photolysis study of phenyl-substituted phenols, quinones, and corresponding free radicals. Part 2. Dimerisation of 2,6-diphenyl-4-methoxyphenoxyl radical in various solvents

1981 ◽  
pp. 1234 ◽  
Author(s):  
Igor V. Khudyakov ◽  
Petr. P. Levin ◽  
Vladimir A. Kuz'min ◽  
Hendrik J. Hageman ◽  
Cornelis R. H. I. de Jonge
Keyword(s):  
Free Radicals ◽  
Flash Photolysis ◽  
Substituted Phenols

Flash-photolysis electron spin resonance in solution studies of free radicals

1984 ◽  
Vol 78 ◽  
pp. 257 ◽  
Author(s):  
Christopher D. Buckley ◽  
Andrew I. Grant ◽  
Keith A. McLauchlan ◽  
Andrew J. D. Ritchie
Keyword(s):  
Free Radicals ◽  
Electron Spin Resonance ◽  
Electron Spin ◽  
Flash Photolysis ◽  
Solution Studies ◽  
Spin Resonance

Thiophosphonyl Radicals Photolytic Generation and Reactivity Towards Olefinic Compounds

1985 ◽  
Vol 40 (6) ◽  
pp. 541-543 ◽  
Author(s):  
T. Sumiyoshi ◽  
W. Weber ◽  
W. Schnabel
Keyword(s):  
Absorption Spectrum ◽  
Free Radicals ◽  
Optical Absorption ◽  
Vinyl Acetate ◽  
Optical Absorption Spectrum ◽  
Rate Constants ◽  
Flash Photolysis ◽  
Uv Light ◽  
Strong Band

Upon irradiation with UV light (λ = 347 nm), 2,4,6-trimethylbenzoyldiphenylphosphine sulfide was found to be fragmented into free radicals by α-scission (F(k) = 0.3 ± 0.1): Flash photolysis studies revealed that the optical absorption spectrum of diphenylthiophosphonyl radicals, S = P(Ph)2. possesses a strong band with λmax = 340 nm and a somewhat weaker band with λmax ≈ 500 nm (e340nm = 1.2 ± 0.2) · 104 1/mol cm). The reactivity towards olefinic compounds, M, is 10 to 30 times lower than in the case of O = P(Ph)2 radicals. Typical bimolecular rate constants (in 1/mol s) of the reaction of S = P(Ph)2 with M are: 4 x 106 (styrene), 6.2 x 105 (methylacrylate), 4.2 x 104 (vinyl acetate).

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