Poly(p-phenylene sulfide) is prepared through the polymerization of diphenyldisulfide with various Lewis acids, such as AlCl3 and SbCl5. Thiophenol also yield poly(p-phenylene sulfide) through its oxidation to diphenyldisulfide in the presence of an oxidizing agent or electrolysis during polymerization. Alkyl-substituted diphenyldisulfides are polymerized with a Lewis acid to efficiently yield alkyl-substituted
E=SAs>Sb. These reactivities are parallel with the electrochemical oxidation potentials reported for Ph2E and with the first ionization potentials reported for Ph3M. The rate of Φ2Te was faster than that of Ph3P and slightly faster than that of Φ3Sb. From the reactivity of [Φ2E-Me]+ salts with nucleophiles, the E+–Me bond strengths were estimated to increase in the order E=Se
Chiral Selenide-Catalyzed Enantioselective Construction of Saturated Trifluoromethylthiolated Azaheterocycles
作者:Jie Luo、Yannan Liu、Xiaodan Zhao
DOI:10.1021/acs.orglett.7b01392
日期:2017.7.7
An indane-based, bifunctional, chiral selenide catalyst has been developed. The new catalyst is efficient for the enantioselectivesynthesis of saturated azaheterocycles possessing a trifluoromethylthio group. The desired products were obtained in good yields with high diastereo- and enantioselectivities.
This invention discloses a method for producing polyarylene thioether by the catalytic oxidative coupling polymerization of at least one compound selected from the group consisting of diaryl disulfides of general formula (I) and thiophenols of general formula (11), wherein R1 to R12 are each as defined in the specification, by using oxygen in the presence of an acid. According to the above method, the reaction proceeds under very mild conditions; the procedure can be simplified; and the starting material and catalyst an available at extremely low cost. Thus, this method is advantageous industrially.