1986-90-9Relevant academic research and scientific papers
A novel binuclear iron(III)-salicylaldazine complex; synthesis, X-ray structure and catalytic activity in sulfide oxidation
Akbari, Ali,Amini, Mojtaba,Bagherzadeh, Mojtaba,Ellern, Arkady,Mesbahi, Elnaz,Woo, L. Keith
, (2020)
A novel binuclear iron(III)-salicylaldazine complex has been synthesized and characterized by various techniques such as IR and UV–Vis spectroscopy and X-ray crystallography. The catalytic oxidation of sulfides in the presence of the aforementioned complex was explored at room temperature using urea hydrogen peroxide (UHP) as an oxidant. Effects of different reaction conditions consisting catalyst and oxidant amount, solvent effect and reaction time on the catalytic activity and selectivity in the reaction of methylphenylsulfide oxidation has been surveyed. Perfect selectivity toward sulfoxide was achieved after 15 min in CH3CN by choice of a properly optimized reaction condition.
Palladium on carbon-catalyzed gentle and quantitative combustion of hydrogen at room temperature
Monguchi, Yasunari,Ida, Takashi,Maejima, Toshihide,Yanase, Takayoshi,Sawama, Yoshinari,Sasai, Yasushi,Kondo, Shin-Ichi,Sajiki, Hironao
supporting information, p. 313 - 318 (2014/05/20)
A quantitative and gentle oxidation (combustion) of hydrogen in the presence of oxygen in a variety of solvents was achieved under palladium on carbon (Pd/C)-catalyzed conditions at ordinary pressures and temperatures. A quantitative generation of water accountable for the consumed oxygen was observed. While hydrogen peroxide (H2O2), which would form as an intermediate, was extremely unstable under the Pd/C-catalyzed conditions to be converted into water with accompanying oxygen generation, the stability of H2O2 was found to be increased in cold (0 °C) trifluoroacetic acid, and the formation of 64% H2O2 based on the consumed oxygen could be detected. A mechanistic elucidation study revealed that the single electron transfer and generation of the hydroxyl radical are involved in the gentle combustion process. The reactive oxygen species generated during the process was effectively utilized for the chemical oxidation of sulfides and phosphines to afford the corresponding sulfoxides and phosphine oxides, respectively.
Enantio- and Diastereoselective α-Metallation of Prochiral Sulfoxides by (+)-Menthyllithium
Maercker, Adalbert,Schuhmacher, Rudolf,Buchmeier, Willi,Lutz, Heinz Dieter
, p. 2489 - 2498 (2007/10/02)
Six out of ten prochiral dialkyl sulfoxides 3 with diastereotopic α methylene protons were stereoselectively metallated by (+)-menthyllithium (11) to yield two diastereomeric pairs of enriched enantiomers 29 after the reaction with benzophenone.The maximum e.e. was 40percent.Dicyclohexyl sulfoxide (3c) was deprotonated enantioselectively with an e.e of 30percent. 2-Bornyllithium (21) was unsuccesful as a chiral base and was shown for the first time to contain 4percent of isobornyllithium (22).The reactions were performed in pentane at -80 deg C; in diethyl ether and THF the e.e's were only slightly higher, and at higher temperatures the selectivity was rapidly decreasing.It was shown that racemization takes place by an intermolecular transmetallation reaction.The structure of 29f (n = 3) was elucidated by an X-ray analysis.Key Words: (+)-Menthyllithium, stereoselective metallation with/ Prochiral sulfoxides, enantio- and diastereoselective α-deprotonation of / 2-Bornyllithium, content of isobornyllithium in / Racemization, mechanism by intermolecular transmetallation/ e.e., temperature dependence of
The Solvation of Phenol by Sulphoxides in Extraction From Aqueous Solutions
Egutkin, N. L.,Malaya, I. P.,Nikitin, Yu. E.
, p. 1813 - 1815 (2007/10/02)
The solvation of phenol by sulphoxides in extraction of the former from aqueous solutions has been investigated.It has been established by the inert diluent and isomolar series methods and by dielectric measurements on the extracted phases that the extraction proceeds with formation of monosolvates.It is shown that the composition of the solvates formed is independent of temperature and the nature of the sulphoxides employed.The extraction constants and the thermodynamic functions for the partition process have been calculated.
