Silver fluorination with

Also, in anhydrous conditions, silver reacts with fluorine and forms silver difluoride AgFj and cobalt gives cobalt(III) fluoride, C0F3, these metals showing higher oxidation states than is usual in their simple salts. 

Silver Fluoride. Silver fluoride, AgF, is prepared by treating a basic silver salt such as silver oxide or silver carbonate, with hydrogen fluoride. Silver fluoride can exist as the anhydrous salt, a dihydrate [72214-21-2] (<42° C), and a tetrahydrate [22424-42-6] (<18° C). The anhydrous salt is colorless, but the dihydrate and tetrahydrate are yellow. Ultraviolet light or electrolysis decomposes silver fluoride to silver subfluoride [1302-01 -8] Ag2p, and fluorine. 

Rearrangement of fluorine with concomitant ring opening takes place in fluorinated epoxides Hexafluoroacetone can be prepared easily from perfluo-ropropylene oxide by isomerization with a fluorinated catalyst like alumina pre treated with hydrogen fluoride [26, 27, 28] In ring-opening reactions of epoxides, the distribution of products, ketone versus acyl fluoride, depends on the catalyst [29] (equation 7) When cesium, potassium, or silver fluoride are used as catalysts, dimenc products also are formed [29]... 

Fluorination with Silver Fluoride from Glycosyl Bromide [17] A mixture of 2,3,4,6-tetra- O-acetyl-a-D-glucopyranosyl bromide (5 g) and anhydrous silver fluoride (5 g) in dry acetonitrile (25 ml) was shaken under argon overnight. The resulting solution was filtered and aqueous sodium chloride was added to precipitate any silver ions from the solution. The mixture was filtered and concentrated to a syrup that was... 

Exchange of the chlorines of 2,5-bis(trichloromethyl)thiophenes for fluorine with silver(I) fluoride has been attempted however, only the chlorines which are attached to methyl groups, are substituted by fluorine, e. g. formation of 4.36... 

Nickel is silver-white, with high electrical and thermal conductivities (both —15% of those of silver) and mp 1452°C, and it can be drawn, rolled, forged, and polished. It is quite resistant to attack by air or water at ordinary temperatures when compact and is therefore often electroplated as a protective coating. Because nickel reacts but slowly with fluorine, the metal and certain alloys (Monel) are used to handle F2 and other corrosive fluorides. It is also ferromagnetic, but not as much as iron. 

Previous methods for the preparation of sulfuryl fluoride have involved either the reaction of elemental fluorine with a variety of sulfur-oxygen compounds or the reaction of silver fluoride with sulfur dioxide. A very simple procedure for the preparation of sulfuryl fluoride in good yield involves the reaction of potassium fluorosulfite with chlorine gas. ... 

Methyl- and trifluoromethylsulfur chloride were fluorinated with silver difluoride. -... 

The heterobimetallic compounds 79-83 comprise Ag(I)-Sn(II) covalent bonds, with similar Ag—Sn bonding distances (Table 2.11.3). In particular, compounds 79 and 80 give dimeric arrangements, while in for 81-83, the use of silver fluorinated tris(pyrazolyl)borates and tin(II) N-alkyl-2-(alkylamino)troponiminates allow the isolation of monomeric compounds. 

Disilver fluoride is a bronze-colored compound with a greenish cast when observed in bulk. It is an excellent electrical conductor. Crystal-structure determination3 shows the complete absence of elemental silver and silver(I) fluoride in the pure material and reveals the presence of successive layers of silver, silver, and fluorine in the lattice. The silver-silver distance is 2.86 A. (nearly twice the metallic radius of 1.53 A.), and the silver-fluorine distance is 2.46 A. [as in ionic silver(I) fluoride]. The compound is regarded as being intermediate in structure between a metal and a salt.4... 

Moissan and Lebeau (1901) produced sulfuryl fluoride by the combination of sulfur dioxide with fluorine (217). Other processes which have been used to produce the gas are (a) the thermal decomposition of barium fluorosulfonate or certain other fluorosulfonates (188, 221, 808), (b) the reaction of sulfur dioxide with chlorine and hydrogen fluoride in the presence of activated charcoal at 400° (11), (c) the reaction of sulfur dioxide and chlorine with potassium or sodium fluoride at 400° (328), (d) the disproportionation of sulfuryl chlorofluoride at 300-400° (328), (e) the reaction of sulfuryl chloride with a mixture of antimony trifluoride and antimony pentachloride at about 250° (86), (f) the reaction of sulfur dioxide with silver difluoride (86), (g) the reaction of thionyl fluoride with oxygen in an electrical discharge (314), (h) electrolysis of a solution of fluorosulfonic acid in hydrogen fluoride (264), ( ) the reaction of fluorine with sodium sulfate, sodium sulfite or sodium thiosulfate (229, 239), (j) the reaction of hydrogen fluoride with sulfuryl chloride (820). 

Peroxydisulfuryl difluoride can be prepared by reaction of fluorine with an excess of sulfur trioxide at about 250° and by the combination of fluorine fluorosulfate with sulfur trioxide. The catalytic fluorination of sulfur trioxide vapor by fluorine in the presence of a heated catalyst of copper ribbon coated with silver(II) fluoride provides a good method for the preparation of a product which can be purified easily. 

Titanium metal is hydrt enated at 600-700°C (see section on Titanium). It is then placed in a small nickel boat s, which in turn is inserted into the horizontal nickel tube o (closed at one end), and the hydride is fluorinated with gaseous HF (see Fig. 136). The open end of the tube has a cooling jacket and is sealed with piceln to a copper cover b. Two copper tubes are silver-soldered into the cover and serve as inlet and outlet for the hydrogen in addition. 

Ulrich, H. Kober, E. Ratz, R. Schroeder, H. Gmndmann, C. S3mthesis ofpolyfluorinated heterocycles by indirect fluorination with silver fluorides. V. Fluorothiophene. J. Org. Chem. 1962, 27, 2593-2595. 

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