41115-75-7Relevant academic research and scientific papers
A laser flash photolysis and theoretical study of hydrogen abstraction from phenols by triplet α-naphthoflavone
De Lucas, Nanci C.,Fraga, Helena S.,Cardoso, Cristiane P.,Correa, Rodrigo J.,Garden, Simon J.,Netto-Ferreira
experimental part, p. 10746 - 10753 (2011/05/19)
The hydrogen abstraction (HA) reaction by the triplet of α-naphthoflavone (1) has been investigated experimentally by the use of laser flash photolysis (LFP) and theoretically with density functional theory (DFT) and atoms in molecules (AIM). The triplet
Photophysical Properties of Methylated Phenols in Nonpolar Solvents
Grabner, G.,Koehler, G.,Marconi, G.,Monti, S.,Venuti, E.
, p. 3609 - 3613 (2007/10/02)
The photophysical properties of phenol and a series of mono-, di-, and trimethyl-substituted phenols excited in their first singlet state in hydrocarbon solvents have been investigated by measuring fluorescence lifetimes and quantum yields and lowest trip
Effect of Ring Substitution on the Photochemistry of α-(Aryloxy)acetophenones
Netto-Ferreira, J.C.,Avellar, I.G.J.,Scaiano, J.C.
, p. 89 - 92 (2007/10/02)
The photochemistry of a series of 10 α-(aryloxy)acetophenones has been examined by quantum yield, product studies, and laser flash photolysis techniques.Triplet decay involves a competition of β-cleavage with intramolecular quenching by the β-aryl group, the latter being favored in all systems.Typical triplet lifetimes at room temperature range from 60 to 260 ps and are rather insensitive to the substitution pattern. β-Cleavage rate constants range between 1*107 and 3*109 s-1 and are strongly favored by electron releasing substituents, such as 4-methoxy.The determination of true quantum yields of β-cleavage requires the addition of thiophenol as a radical trap to prevent the efficient back reaction that takes place otherwise; under these conditions quantum yields range from 10-3 to 0.14, the highest value being obtained for the 4-methoxy and 4-hydroxy derivatives.
Substituent Effects on Rates of One-Electron Oxidation of Phenols by the Radicals ClO2, NO2, and SO3(1-)
Alfassi, Zeev B.,Huie, Robert E.,Neta, P.
, p. 4156 - 4158 (2007/10/02)
Rate constants for the reactions of ClO2, NO2, and SO3(1-) radicals with several substituted phenoxide ions have been measured by pulse radiolysis.They vary from the immeasurably slow (4) to almost diffusion-controlled rates (>109 M-1 s-1) and depend on the redox potentials of the phenoxide ions and the inorganic radicals.With the weak oxidant SO3(1-) reverse reactions were observed in certain cases; i.e., the phenoxyl radical oxidizes sulfite ions.An attempt is made to correlate the rate constants with Hammett's substituent constants and the results are compared with those obtained previously for the reactions of various inorganic radicals with phenols and phenoxide ions.
Reaction of Azide Radicals with Aromatic Compounds. Azide as a Selective Oxidant
Alfassi, Zeev B.,Schuler, Robert H.
, p. 3359 - 3363 (2007/10/02)
In basic aqueous solution the N3. radical is found to oxidize aromatic systems such as aniline and phenoxide ions and their deivatives at rate constants of (3-5) X 109 M-1s-1.In contrast to the reactions of OH radicals, wh
Reaction of tert-Butoxy Radicals with Phenols. Comparison with the Reactions of Carbonyl Triplets
Das, P. K.,Encinas, M. V.,Steenken, S.,Scaiano, J. C.
, p. 4162 - 4166 (2007/10/02)
Tert-butoxy radicals generated in the photodecomposition of di-tert-butyl peroxide react efficiently with phenols to yield the corresponding phenoxy radicals.Typical rate constants in benzene at 22 deg C are 3.3x108 and 1.6x109 Msup
