2 2 chloro 1 1 2 trifluoro 2 perfluoropropoxy ethoxy terephthaloyl dichloride 46 04 g 74 5 yield with a boiling point 124 126 u00b0 c at 1 1 torr in a dry box tetrahydrofuran thf 1000 ml and dimethyl 5 hydroxyisophthalate 42 00 g 0 20 mol were added to an oven dry round bottom reaction flask equipped with a stirrer to form a reaction mixture potassium t butoxide 6 16 g 0 055 mol was added to the reaction flask 1 1 1 2 2 3 3 heptafluoro 3 1 1 1 2 3 3 hexafluoro 3 1 2 2trifluorovinyloxy propan 2 yloxy propane 216 g 0 50 mol was then added via the addition funnel to the reaction mixture and the reaction allowed to stir at room temperature after 24 hour the reaction was terminated via the addition of 80 ml of 10 hcl the reaction mixture was concentrated at reduced pressure diluted with dichloromethane washed with 10 hcl 2 u00d7 100 ml and then with water 2 u00d7 100 ml to form an aqueous phase and an organic phase the separated organic phase was dried over anhydrous sodium sulfate and was then concentrated at reduced pressure to form a crude product the crude product was purified by column chromatography to give 86 07 g 67 32 yield of the desired material dimethyl 5 1 1 2 trifluoro 2 1 1 2 3 3 3 hexafluoro 2.