Phenol → 2-Trifluoromethyl-2-(2-phenoxytetrafluoroethyl)-1,3-dioxolane

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Reaction Steps

A suspension of 12.0 g (0.25 mol) of 50 % NaH in mineral oil in 100 mL of dry diglyme (diethylene glycol dimethyl ether) was stirred at 25° under nitrogen while a solution of 23.5 g (0.25 mol) of phenol in 50 mL of diglyme was added. The resulting mixture was stirred until evolution of gas ceased, then charged into a 400 mL metal tube along with 44.3 g (0.25 mol) of 2-chloroethyl trifluoroacetate and 40 g (0.70 mol) of tetrafluoroethylene. The resulting mixture was agitated for 6 h while the temperature rose to 34° and subsided. Next the mixture was heated at 50° for 6 h. The resulting reaction mixture was added to L of water, thereby causing the formation of layers. The lower layer was separated, washed with water, dried over CaSO4, and distilled to give 61.2 g (73% yield) of 2-trifluoromethyl-2(2-phenoxytetrafluoroethyl)-1,3-dioxolane, b.p. 64°-67° at 13 Pa (0.1 mm). The IR (CCl4) and NMR (CC14) spectra of the product were consistent with the structure assignment. Anal.: Calcd. for C12H9F7O3 :C,43.13; H, 2.71; F, 39.80. Found: C, 43.23; H, 2.75; F, 39.90.

Provenance & Evidence