An efficient copper-catalyzed system for C-S cross-coupling of aromatic thiols with aryl bromides and chlorides has been developed using 1,2,3,4-tetrahydroquinoline-8-ol as a ligand. It is noteworthy that this method is proved to be especially effective for aryl bromides with electron-donating groups. By this protocol, a variety of thioethers as well as symmetrical and unsymmetrical bis-thioethers
[EN] PIPERIDINE-BASED STABILIZERS AND POLYMERS END-CAPPED WITH THE SAME<br/>[FR] STABILISANTS À BASE DE PIPÉRIDINE ET POLYMÈRES FONCTIONNALISÉS AVEC CEUX-CI PAR TRAITEMENT DE "END CAPPING"
申请人:SOLVAY SPECIALTY POLYMERS USA
公开号:WO2015176978A1
公开(公告)日:2015-11-26
The invention relates to piperidine-based compounds of formula (I) that are used to improve UV, thermal, and thermo-oxidative stability of high performance aromatic polymers in a blend or as end-cappers of the same polymers.
Hydroxybenzophenone-based stabilizers and polymers end-capped with the same
申请人:SOLVAY SPECIALTY POLYMERS USA, LLC
公开号:US20170240723A1
公开(公告)日:2017-08-24
The invention relates to hydroxybenzophenone-based compounds of formula (I) that are used to improve UV, thermal, and thereto-oxidative stability of high performance aromatic polymers in a blend or as end-cappers of the same polymers.
A regioselective C–H sulfanylation of aryl sulfoxides with alkylaryl sulfides in the presence of acid anhydride was developed, which resulted in the formation of 1,4-disulfanylarenes after dealkylation of initially formed sulfonium salts. The reaction began with Pummerer-type activation of aryl sulfoxides followed by nucleophilic attack of alkylaryl sulfides. The nucleophilic attack occurred exclusively
A piperidine-based stabilizer compound of formula (I) or (II) that imparts UV, thermal, and/or thermo-oxidative stability to polymer compositions and more specifically to aromatic polymers and polymer compositions thereof.