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At 20° to 25° C. and over a period of 1 hour, 108 ml of triethylamine was dripped into a mixture of 165 g (0.71 mol) of 1-bromo-2-(2-fluorobenzyloxy)-ethane, 116 g (0.7 mol) of N-hydroxyphthalimide and 710 ml of N-methyl-2-pyrrolidone. After the mixture had been kept for 5 hours at 60° C., the cold mixture was poured into 2000 ml of ice water, the precipitate was suction filtered, washed with water and isopropanol and dried under reduced pressure over phosphorus pentoxide. There was obtained 185 g (82%) of phthalimide ether, m.p. 62°-64° C. 1H-NMR (250 MHZ, d6 -DMSO): δ=3.85 (m,2H), 4.35 (m,2H), 4.54 (s,2H), 7.10-7.40 (m,4H), 7.88 (s,4H).

1. waitAfter the mixture had been kept for 5 hours at 60° C.
2. filtrationfiltered
3. washwashed with water and isopropanol
4. dry with materialdried under reduced pressure over phosphorus pentoxide