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Cesium fluonde

The use of cesium fluoride is limited because of its cost and its availability as a truly anhydrous reagent. Its use with 18-crown-6 shows a 5 times higher rate for the formation of benzyl fluoride from benzyl bromide when compared with cesium fluonde or potassium fluoride supported on calcium fluoride [21] Either cesium fluoride or potassium fluoride supported on calcium fluoride (Procedures 5a and 5b, p 194) provides about a twofold improvement over either unsupported alkali metal fluoride [55, 69], Cesium fluoride and Aliquat 336 convert benzyl bromide to the fluoride in 94% yield. Using tetrabuty lammonium fluoride in place of Aliquat... [Pg.191]

The effectiveness of various sources of fluoride ion in the displacement of the trifluoromethanesulfonic group has been demonstrated while introducing a fluorine atom into the five-membered carbocyclic ring of a prostaglandin precursor Treat tnent of the corresponding triflyl derivative with potassium fluoride in acetonitrile or with cesium fluonde in refluxing diinethylformamide or hexamethylphosphoric... [Pg.213]

The enolate of dimethyl trifluoromethylmalonate, formed by the action of cesium fluonde [II9] or of an electrolytically generated pyrrolidone anion [120], can be alkylated with methyl iodide (equation 103)... [Pg.473]

Perfluoropyridine gives the usual replacement of the 4-fluonne on reactions with either aromatic or aliphatic mercaptides [55, 36] The reaction of perfluoropyridine with cesium tnfluoromethyl mercaptide, generated from thiocarbonyl fluoride and cesium fluonde, shows temperature dependence of selectivity in fluonne displacement [55 36] (equation 24)... [Pg.508]

Cesium fluonde in dimethylformamide catalyzes the isomerization offluori-nated cyclobutenes, perfluorobipyntmdines, and their oligomers to products with expanded rings [30, 31, 32] The product distribution in cobalt tnfluonde fluorina-tion depends strongly on the temperature of the reaction [33] Fluorinated 1-dimethylamino-5,6,7,8-tetrafluoro-l,4-dihydro-l,4-ethenonaphthalene rearranges in protic media to a biphenyl derivative [34] (equation 8)... [Pg.915]

Carbon-nitrogen multiple bonds in fluorinated imines and nitriles react with halogen fluoride reagents Imines provide At-chloroamines on reaction with chio rine fluonde [62, 121,122,123] (equations 23 and 24) or with cesium fluoride and chlorine [124] and / -bromoamines on reaction with cesium fluonde and bromine (equation 24)... [Pg.68]


See other pages where Cesium fluonde is mentioned: [Pg.201]    [Pg.279]    [Pg.917]    [Pg.201]    [Pg.917]    [Pg.503]    [Pg.201]    [Pg.279]    [Pg.767]    [Pg.917]   
See also in sourсe #XX -- [ Pg.191 , Pg.192 ]

See also in sourсe #XX -- [ Pg.191 , Pg.192 ]

See also in sourсe #XX -- [ Pg.191 , Pg.192 ]




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Fluondes

Reaction with cesium fluonde

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