Functionalized fluorinated arylethers by ring-opening of 1,2,3,4-tetrafluorodibenz[b,f][1,4]oxazepine

Treatment of 1,2,3,4-tetrafluorodibenz[b,f][1,4]oxazepine with acetyl or benzoyl chloride produces the fluorinated aryl ethers bearing amide and aldehyde functionalities, RCONHC₆H₄-2-OC₆F₄CHO-2 (2a R=Ph; 2b R=Me). The structures of intermediate compounds produced by addition of acid chloride across the imine bond and by partial hydrolyis of the resulting chlorine-containing compound have been determined.