Preparation of 2,2-difluorooctane
100 g of anhydrous HF in 74 g of ether or 56 g of acetone are introduced through a copper tube into an ice-cooled 500-ml copper flask, then 1 mole of 1-octyne is dropped in as slowly as possible. The mixture is allowed to warm to room temperature and after 1 hour is poured on ice. The organic layer is separated and distilled (b.p. 137.5° C). The yield of 2,2-difluorooctane is 70-90%.
J. Amer. Chem. Soc, 65, 587 (1943).