title: Oxidative Direct Arylation Polymerization Using Oxygen as the Sole Oxidant: Facile, Green Access to Bithiazole-Based Polymers.
abstract: The most appealing oxidant, molecular oxygen, is employed for the first time as the sole oxidant in the transition metal-catalyzed oxidative direct arylation polymerization (C-H/C-H-type DArP), which eliminates by-product formation of stoichiometric metal salts except for water . Compared to conventional approaches, other than the avoidance of an end-capping procedure, the current protocol is remarkably advanced in the aspect of eco-friendliness, step- and cost-economy, and, of special significance, the purity of polymer products. As illustrative examples, six 5,5'-bithiazole-based polymers are synthesized using this new method, demonstrating higher number-average molecular weight (Mnup to 33 700) in better yields (up to 93 %) through only one step. The evolution of C-H/C-H-type DArP from heavy metal salts to O2alone as the oxidant could solve the problem of metal residues in polymers, which is considered harmful to the performance of devices.
authors.affiliation: Key Laboratory of Green Chemistry and Technology of the Ministry of Education, College of Chemistry, Sichuan University, 29 Wangjiang Road, Chengdu, 610064, China.|College of Optoelectronic Technology, Chengdu University of Information Technology, Chengdu, 610225, China.
authors.forename: Qiang
authors.initials: Q
authors.lastname: Guo
authors.affiliation: Key Laboratory of Green Chemistry and Technology of the Ministry of Education, College of Chemistry, Sichuan University, 29 Wangjiang Road, Chengdu, 610064, China. wood@scu.edu.cn.
authors.forename: Di
authors.initials: D
authors.lastname: Wu
authors.affiliation: Key Laboratory of Green Chemistry and Technology of the Ministry of Education, College of Chemistry, Sichuan University, 29 Wangjiang Road, Chengdu, 610064, China. jsyou@scu.edu.cn.
authors.forename: Jingsong
authors.initials: J
authors.lastname: You
mesh_terms: D010100:Oxygen / Q000737:chemistry*; D058105:Polymerization; D011108:Polymers / Q000737:chemistry*; D013844:Thiazoles / Q000737:chemistry*
chemical_list: D011108:Polymers; D013844:Thiazoles; D010100:Oxygen
keywords: bithiazole; oxidative direct arylation polymerization; oxygen; palladium; polymer