Rubidium fluoride

Adducts of the hexafluoride with sodium fluoride, potassium fluoride, rubidium fluoride, caesium fluoride or nitrosyl fluoride react violently with water. 

In the vapor phase, perfluoro-2-azopropene has been oxidized at high temperatures with oxygen using rubidium fluoride as a catalyst to produce IV-nitrosobis(trifluromethyl)amine, b.p. -3°C to -4°C [34] (Eq. 5). 

The addition of chlorine monofluoridc across the C = 0 bonds in difluorophosgene, per-fluoroacyl fluorides, and perfluoroketones with the formation of hypochlorites occurs only in the presence of the catalysts potassium fluoride, rubidium fluoride, cesium fluoride80,81 or the strong Lewis acids hydrogen fluoride, boron trifluoride, or arsenic(V) fluoride.82 The cesium fluoride catalyzed reactions are carried out in an autoclave for 2-3 hours at — 20"C or left overnight.80... 

Rubidium fluoride is a fairly expensive reagent and has been used rarely in replacing halogens and sulfonates with fluorine. l-Chloro-2,4-dinitrobenzene (19) has been reacted with rubidium chloride to give l-fluoro-2,4-dinitrobenzene (20).185... 

Rubidium fluoride offers no advantage over cesium fluoride in fluorine replacement reactions. For example, in the reaction of / -(nitrophenyl)dimethylsulfonium methyl sulfonate (21) with cesium and rubidium fluoride, rubidium fluoride afforded the fluoro derivative 22 in 51 % yield as well as the side product 23. In contrast cesium fluoride gives 66% yield of 22 and only 20% of the side product 23.180... 

F-Marked rubidium fluoride has been used to prepare several 18F-marked aryl fluorides 25 from precursors 24. The radiochemical yield lies between 0-60%,186... 

The Cs2 [Pt(CN)4 ] -H20 and Rb2 [Pt(CN)4 ] 1.5H2 0 starting materials for these preparations are synthesized as described by Maffly et al.3 and Koch et al.,4 respectively. The cesium fluoride and rubidium fluoride are 99.9% pure. All other chemicals are ACS reagent grade. Distilled water is used throughout the procedures. 

Rubidium fluoride, RbF.—The fluoride is obtained in anhydrous crystals by concentrating a solution of sodium carbonate neutralized with hydrofluoric acid.3 Its melting-point is given as 753° C.4 and 775° C.5 The boiling-point is 1410° C., and the vapour-pressure in atmospheres is given by the expression8... 

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