Use as fluorinating agent

The tetrafluorides of the elements can be prepared. They are all less stable than the corresponding hexafluorides and are hydrolysed readily by water. They can all be used as fluorinating agents and sulphur tetrafluoride is extensively used for this purpose, for example the fluorination of organic carbonyl groups ... 

Fluorine in the free state is too reactive to be of a direct practical value, but it may be used to prepare other compounds of fluorine, which are then used as fluorinating agents, for example chlorine... 

Mixtures of anhydrous hydrogen fluoride and tetrahydrofuran are successfully used as fluorinating agents to convert 1,1,2-trifluoro-l-allcen-3-ols, easily prepared from bromotrifluoroethene via lithiation followed by the reaction with aldehydes or ketones, to 1,1,1,2-tetrafluoro-2-alkenes The yields are optimal with a 5 1 ratio of hydrogen fluoride to tetrahydrofuran The fluorination reaction involves a fluonde lon-induced rearrangement (Sf,j2 mechanism) of allylic alcohols [65] (equation 40)... 

Both gas and liquid are very sol in water. Can be prepd by distUlation from the product of reaction of Ca fluoride (fluorspar) and sulfuric acid. Used as fluorinating agent in organic and inorganic reactions production of fluorine and A1 fluoride prepn of hydrofluoric acid production of fluoroborates, fluorosilicates, etc as an additive in liquid rocket propellants and for refining of uranium (Ref 3, p 588-R)... 

There are some reactions in which boron trifluoride and boron trifluoride-diethyl ether complex are used as fluorinating agents, but they are not so frequently used and widespread. The best-known reaction is the decomposition of fluoroformates. In this type of reaction boron trifluoride or pyridine are essentially required as catalysts for the decomposition process. The formation of fluoroformates is established4 5 and the decomposition proceeds cither by heating in pyridine at higher temperature6 or by addition of boron trifluoride-diethyl ether complex at 0-50°C.7... 

Disodium and barium hexafluorosilicate can also be used as fluorinating agents. High purity disodium hexafluorosilicate can be obtained from high purity diammonium hexafluorosilicate and sodium chloride. Diammonium hexafluorosilicate for this process is purified by sublimation.14... 

NaBF4, mw 109.81 wh cryst pdr with bitter taste sp gr 2.47 at 20° sp 384° with slow decompn sol in w, si sol in alk. Can be prepd by heating NaF hydrofluoboric acid, followed by slow cooling crystn. Used as fluorinating agent, also in fluxes for non-ferrous metals, in electrochem processes and as oxidation inhibitor Refs 1) Gmelin-Kraut Syst Number 21 (1928), 681 2) Lange (1961), 308(Fluo-... 

XeF4 + C6H6 3/43/4 Xe + C6H5F + HF (XeF4 is used as fluorinating agent.)... 

Instead of F2, CIF3 and BrFj are also used as fluorinating agents for graphite. At low T BrFj forms mainly n charge-transfer compounds , but an increase in T yields the at least partly covalent products (CFJ -y CIF3 and (CFJ -y BrF3 , and finally pure... 

Anhydrous hydrogen fluoride or pyridinium poly(hydrogen fluoride), sulfur tetrafluoride, iodine fluoride, or N-F compounds can be used as fluorinating agents too. Glycosyl fluorides 6-8 are formed under the action of the hydrogen fluoride, on the protected furanosydes, in nitromethane/carboxylic acid anhydride... 

The most common method for the preparation of perfluorinated tetrahydrofurans is fluorination of tetrahydrofurans. Elemental fluorine or high-valency metal fluorides (AgF2, Mnp3, Hgp2, and Cop3) are usually used as fluorinating agents. ... 

Compound 30 can be used as fluorinating agent, formally transferring F" to substrates such as phenols, anilines, and various carbanions including (CF3)2CF- (Fig. 9.29). 

KHFj and NH HF can be used as fluorinating agents to yield complex fluorides. 

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