反应详情

A solution of 52.5 g (0.30 mol) of the amide from Part A in 200 ml of diglyme was stirred at -10° while 47.5 g (0.60 mol) of pyridine and then 63.0 g (0.30 mol) of trifluoroacetic anhydride were added. The cooling bath was removed, and the mixture was stirred at about 25° for 2 h. Evaporation of volatiles to 40° (4.5 mm) gave 42.7 g of crude product, which was distilled to afford 36.5 g (77%) of 3-methoxytetrafluoropropionitrile, b.p. 53°. IR (neat): 3.36 and 3.48 (sat'd CH), 4.42 (CN), 8-10μ (CF, C--O). NMR: 1H 3.78 ppm (s, OCH3): 19F -93.2 (t, JFF 6.3 Hz, 2F, CH2) and -108.8 ppm (t, JFF 6.3 Hz, 2F, CF2). Elemental analysis was consistent with the formula C4H3F4NO. ##STR54##

1. customThe cooling bath was removed
2. customEvaporation of volatiles to 40° (4.5 mm)
3. customgave 42.7 g of crude product, which
4. distillationwas distilled