109099-31-2

Upstream product

• 119-61-9 benzophenone 
• 91-66-7 N,N-diethylaniline 
• 119-61-9 benzophenone radical anion 
• 90-15-3 α-naphthol 
• 135-19-3 β-naphthol 

Relevant academic research and scientific papers

Laser photolysis studies on hydrogen atom abstraction by triplet benzophenone from hydroxyanilinium ions

By means of 355 nm laser flash photolysis in the benzophenone-hydroxyanilinium ion system in acetonitrile-H2O (1:1, v/v) with [H2SO4] = 0.18 M, it is found that the products of H-atom abstraction by triplet benzophenone from hydroxyanilinium ion are the benzophenone ketyl and hydroxyaniline cation radicals, i.e. the NH+3 group is more reactive to H-atom abstraction by triplet benzophenone than the OH. The more protic the hydrogen atom is, the more reactive it is found to be for H-atom abstraction by triplet benzophenone in a collision complex with charge-transfer character in the liquid phase.

Photoreduction of Benzophenone by Diethylaniline in 2-Methyltetrahydrofuran As Studied by Laser Photolysis in the Temperature Range 300-80 K

Laser photolysis studies of benzophenone in a 2-methyltetrahydrofuran (MTHF) solution containing 1.7 M diethylaniline have been carried out in the temperature range 300-80 K.Only the ketyl radical is detected in the temperature range 300-180 K.The transient spectrum having absorption bands at 740 and 470 nm is observed in the range 160-100 K: the former band is very similar to that of the benzophenone anion radical and the latter to that of the cation radical of diethylaniline.The transient decays according to first-order kinetics.The rate constant, kd, is expressed as a function of temperature: kd = k0 + 1.12E9 exp(-2000/RT) s-1, where k0 -1.The slow formation of the ketyl radical is detected in the range 160-140 K.The rate for the formation of the ketyl radical at 160 K is found to be identical with that for the decay of the transient having absorption bands at 740 and 470 nm, indicating that the ketyl radical is produced from the transient.No formation of the ketyl radical is observed below 100 K.At 80 K, the transients are the triplet benzophenone and the triplet molecular complex between benzophenone and diethylaniline.Phosphorescence spectra are measured for the MTHF solution of benzophenone in the presence of 1.7 M diethylaniline in the temperature range 300-80 K.Broad phosphorescence centered around 520-580 nm observed in the range 140-100 K is considered to be due to the triplet exciplex formed between the triplet benzophenone and diethylaniline.On the basis of phosphorescence and laser photolysis studies, the transient having the absorption bands at 740 and 470 nm is ascribed to the triplet exciplex between the triplet benzophenone and diethylaniline with a strong charge-transfer interaction.

Influence of Large Magnetic Fields on the Dynamic Behavior of a Radical Pair Produced by Photoreduction of Benzophenone in a Micellar Solution

The photochemical reaction of benzophenone in a micellar sodium dodecylsulfate solution was investigated under magnetic fields of 0-10 T.The decrease of decay rate of the ketyl radical and the increase of the yield of the escaped radical were saturated around 2 T.The contribution of the Δg mechanism was not observed below 10 T since the Δg value is very small for this system.

Solvent dependence of triplet energy transfer from triplet benzophenone to naphthols and methoxynaphthalenes

Solvent effects on triplet-triplet energy transfer (TET) from triplet benzophenone (3BP*) to naphthol (NpOH) competing with hydrogen atom abstraction (HA) of 3BP* from NpOH and methoxynaphthalene (NpOMe) without HA have been studied in fluid media by 355 nm laser flash photolysis at 295 K. The efficiency (ψTET) and rate constant (kTET) of TET in these systems were obtained. It was shown that the value of kTET was dependent not only on the solvent viscosity (η) but also on the dielectric constant (κ) of the solvents, and ψTET and kTET increased with increasing κ, contrary to the Dexter prediction. An increase in kTET with increasing κ may be caused by the contribution of the dipole-dipole interaction (by the Foerster theory) due to perturbation of the 1(π, π*) state to the lowest triplet state 3(n, π*) of benzophenone, in addition to the electron-exchange mechanism (by the Dexter theory).

An Investigation by Diffusion Layer Imaging of Coupled Homogeneous Chemical Reactions of the Benzophenone Radical Anion in N,N-Dimethylformamide

The electrochemical reduction of benzophenone (BP) to its primary radical anion BP.- with coupled homogeneous chemical reactions was investigated in N,N-dimethylformamide.Protonation of BP.- with benzoic acid and with o-cresol, respectively, used as proton donors, and disproportionation of BP.- in the presence of excess Li+ ions were studied by DLI technique.Rate constants for protonation and disproportionation as well as equilibrium constants for ion association were evaluated.Possible reaction pathways, and the effect of ion association on the kinetic behaviour are discussed. - Keywords: Chemical Kinetics / Diffusion / Electrochemistry / Spectroelectrochemistry