31053-91-5

Upstream product

• 50-44-2 6H-purine-6-thione 
• 106-54-7 p-Chlorothiophenol 
• 1142-19-4 4,4'-dichlorodiphenyl disulfide 

Relevant academic research and scientific papers

Flash Photolysis Study of Solvent Effects in Addition Reactions of Thiyl Radicals to Styrene or α-Methylstyrene. Interaction between p-Chlorobenzenethiyl Radical and Methylbenzenes

The absorption spectra and the absolute rate constants of the addition reactions of the para-substituted benzenethiyl radicals to styrene and α-methylstyrene in cyclohexane and in ?-electron-donor solvents such as benzene and mesitylene have been determined by flash photolysis.Broadenings of the absorption bands of the p-chlorobenzenethiyl radical observed in ?-donor solvents were ascribed to the weak interaction between the radical center and ? electrons of solvents; the addition rate constants to styrenes in mesitylene were smaller than those in cyclohexane (1:1.5).No appreciable solvent effect was observed both in the spectra and in the rates of the p-methylbenzenethiyl radical.

Reactivities of Cycloalkenes toward Phenylthio Radicals

The absolute rate constants for the addition reactions of the (p-chlorophenyl)thio radical toward cyclomonoalkenes, cycloalkadienes, and bicycloalkenes have been determined by the flash photolysis method by taking the reversibility of the addition process

Synthesis and radiation sensitivity of phenoxazine type color formers including thiol ester protective group

3,7-Bis(N,N-diethylamino)-10-(phenylthio)carbonylphenoxazine (1a) and its analogs (1b-f) were synthesized and the color change after γ irradiation was investigated. The color change of acetonitrile solutions of 1a ([1a] 0 = 1.0 × 10-3 M) after γ irradiation was identified by naked eyes at the dose of 20 Gy. Phenylthio-substituted compound la showed more significant absorbance increase than phenoxy-substituted compound, 3,7-bis(N,N-diethylamino)-10-phenoxycarbonylphenoxazine (2a). The C-S cleavage in la by γ irradiation was revealed to occur more easily than the C-O cleavage in 2a. The sensitivity of the color formers 1a-f) to γ rays was correlated with the stability of the thiyl radicals generated in the reaction.

Photochemical properties of excited triplet state of 6H-purine-6-thione investigated by laser flash photolysis

Photochemical reactions of 6H-purine-6-thione (PuT) via the excited triplet state [3(PuT)*] have been studied by means of laser flash photolysis in organic solvents. Transient absorption bands at 475 and 690 nm were assigned to 3(PuT)*. Intersystem quantum yield and the lowest triplet energy of 3(PuT)* were evaluated to be 0.99 and 63 kcal/mol, respectively. The self-quenching rate constant is quite large (2.3×109 M-1 s-1 in THF). In photoinduced electron transfer, 3(PuT)* acts as electron acceptor for tetramethylbenzidine, while 3(PuT)* acts as electron donor for p-dinitrobenzene. Rate constants for H-atom abstraction (khT) of 3(PuT)* from benzenethiols, tocopherol, and 1,4-cyclohexadiene are on the order of 108 M-1 s-1. From the Hammett plots of khT for substituted benzenethiols, a negative ρ value indicates that 3(PuT)* has electrophilic character. In the addition reaction of 3(PuT)* toward various alkenes, the electrophilic character of 3(PuT)* was also confirmed. By steady-light photolysis of PuT, purine was produced via 3(PuT)* after H-atom abstraction. On combination of these results, the character of the lowest 3(PuT)* was presumed.

Evaluation of dissociation energies of S-H bonds in thiophenols and thioalcohols on the basis of kinetic measurements

Kinetic data on the reactions of alkyl and benzyl radicals with thiophenol C6H5SH were analyzed within the framework of the parabolic model of transition state. The values of the parameter that establishes a correlation between the activation energy of a reaction and its enthalpy were calculated for reactions of alkyl and benzyl radicals with the C6H5SH. The equations of the parabolic model were used to calculate the bond dissociation energies for 11 thiophenols and 4 thioalcohols. The activation energies for reactions of 12 thiophenoxy radicals with cumene and of C6H5S? radical with several alkyl-aromatic hydrocarbons were obtained.

Substituent Effects on the Free-radical Addition Reactions of Arylthiyl Radicals with Arylacetylenes

Absolute rate constants for addition reactions of arylthiyl radicals (YC6H4S.) to arylacetylenes (XC6H4CCH) have been determined by a flash-photolysis method.The rate constants (in dm3 mol-1 s-1) vary from 1.

Thiol-Olefin Cooxidation (TOCO) Reaction. 9. A Self-Consistent Mechanism under Nonradical-Inducing Conditions

The rate of oxygen consumption and the product distribution in the TOCO reaction under various experimental conditions are investigated and a self-consistent mechanism for the reaction under nonradical-inducing conditions is proposed that takes into consideration the observed structural and catalytic effects.Some interesting similarities between hydrogen bromide-olefin and thiol-olefin systems are discussed.

Kinetic Study for Spin-Trapping Reactions of Thiyl Radicals with Nitroso Compounds

The rate constants for the reactions of para-substituted benzenethiyl radicals with nitroso compounds have been determined by flash photolysis.For the benzenethiyl radical the rate constants (M-1 s-1) decreased in the order pentameth