Dimethyl Sulfate → 1,1,1,2,3,4,4,4-Octafluoro-2-methoxy-3-(trifluoromethyl)butane

The title compound was prepared essentially as in Example 3 using anhydrous potassium fluoride (12.8 g, 0.22 mol), anhydrous diethylene glycol dimethyl ether (diglyme, 106 g), methyltrialkyl(C8 -C10)ammonium chloride (Adogen™ 464, available from Aldrich Chemical Company, 4 g), CF3COCF(CF3)2 (53.2 g, 0.20 mol, prepared essentially by the procedure of Smith et al., J. Am. Chem. Soc., 84, 4285 (1962)), and dimethyl sulfate (33.9 g, 0.72 mol). Aqueous potassium hydroxide was added to the reaction mixture (approximately 25 g of 50% solution), followed by water (200 mL). The resulting crude product was azeotropically distilled from the reaction mixture. The lower phase of the resulting distillate was separated from the upper phase, was washed with water, was dried over anhydrous sodium sulfate, and was distilled (b.p. 82-83° C.; yield of 45 g). The product identity was confirmed by GCMS and by FTIR.

1. customprepared essentially by the procedure of Smith et al., J
2. distillationThe resulting crude product was azeotropically distilled from the reaction mixture
3. customThe lower phase of the resulting distillate was separated from the upper phase
4. washwas washed with water
5. dry with materialwas dried over anhydrous sodium sulfate
6. distillationwas distilled (b.p. 82-83° C.; yield of 45 g)

ORD record

ord-3684824c64134b53a3716a887247620e

Source dataset

uspto-grants-1999_07

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US05925611