Diethyl bromoterephthalate (30.1 g, 100 mmol), K2CO3 (27.6 g, 200 mmol), 140 ml of toluene and 140 ml of H2O were placed in the reaction vessel and flushed with argon for 30 minutes. 4-Hexyloxyphenylboronic acid (26.7 g,120 mmol) (cf. B1) and Pd(PPh3)4 (1.16 g, 1 mmol) were subsequently added under protective gas. The yellowish green, turbid mixture was stirred vigorously under a blanket of protective gas at an internal temperature of 85° C. After 7 hours, the reaction was complete. After phase separation, the organic phase was shaken with dilute HCl/H2O (until neutral). The aqueous phase was shaken with toluene and the organic phases were combined. After filtration from any palladium residues, the solution was evaporated.
