2-Bromothiophene → Diketopyrrolopyrrole

Participants

Reaction Steps

A mixture of 1,5-dihexyl-3,7-di-(5-bromothiophen-2-yl)-1H,5H-pyrrolo[2,3-f]indole-2,6-dione (0.100 g, 0.148 mmol), 2,5-dihydro-2,5-bis(2-octyldodecyl)-3,6-bis[5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-2-thienyl]-pyrrolo[3,4-c]pyrrole-1,4-dione (0.168 g, 0.150 mmol), Pd2(dba)3 (4.0 mg), tri-tert-butylphosphonium tetrafluoroborate (2.0 mg), K3PO4 (0.095 g) and toluene/H2O (8 mL/0.3 mL) was heated at reflux for 48 h. 2-bromothiophene (0.035 g, 0.22 mmol) in toluene (1 mL) was added and the resulting mixture was stirred for another 12 h. Then, after cooling to room temperature, the mixture was dropped into methanol to precipitate. After being filtered and dried, the precipitation was Soxhlet extracted with methanol, acetone, hexane, dichloromethane and chloroform in succession. The chloroform solution was concentrated and reprecipitated in methanol. The solid was filtered and dried to yield polymer (0.14 g, 70%) as a black solid.

Provenance & Evidence