Oxidative Direct Arylation Polymerization Using Oxygen as the Sole Oxidant: Facile, Green Access to Bithiazole-Based Polymers.
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 (Mn up 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 O2 alone as the oxidant could solve the problem of metal residues in polymers, which is considered harmful to the performance of devices.
['Guo|Qiang|Q|', 'Wu|Di|D|', 'You|Jingsong|J|']
D010100:Oxygen D058105:Polymerization D011108:Polymers D013844:Thiazoles
oxidative direct arylation polymerization oxygen polymer bithiazole palladium