Читать книгу Concise Handbook of Fluorocarbon Gases - Sina Ebnesajjad - Страница 24

Organic fluorine compounds rarely occur naturally in contrast to bromine and chlorine products. The most famous naturally existing organic fluorine-containing compound is probably monofluoroacetic acid (FCH₂COOH). This compound is found in a South African plant called “Gifblaar,” which is known to be so poisonous that ingesting only a half of its leaf is enough to kill a cow. In 2003, a Chinese research group discovered fluorine-containing compounds from the extract of a marine sponge called Phakellia fusca. Another example of a naturally occurring organic fluorine containing compound is called nucleocidin. Even the presence of elemental fluorine has been reported in fluorspar (CaF₂) containing radioactive uranium [2].

None of the rare natural organic compounds are useful as a source for C-F bonds for commercial production of chemicals. The easiest route to produce carbon fluorine (C-F) bond is via hydrofluoric acid (HF). Acid grade fluorspar (CaF₂) is combined with sulfuric acid to produce HF and calcium sulfate. Chloroform is produced by and chlorination of methane. Catalytic reaction of HF and CHCl₃ produces CHClF₂, which is the starting point for producing many fluorocarbons.