Caesium fluoride

This description would assign to the caesium atom in the caesium fluoride crystal a resultant charge + and to the fluorine atom a charge — It has seemed to me likely that in general all of the atoms in the complexes that constitute stable chemical substances have resultant electrical charges smaller than those shown by these most electropositive and electronegative atoms in their compounds with one another, and I have accordingly formulated the postulate of the essential electrical neutrality of atoms namely, that the electronic structure of substances is... 

Caesium fluoride, Fluorine See Fluorine Caesium fluoride, etc. See other ORGANIC ACIDS... 

Benzenediazonium tetrafluoroborate, Caesium fluoride Baum, K., J. Org. Chem., 1968, 33, 4333... 

Use of caesium fluoride as base to effect condensation caused an explosion in absence of solvent. Pyridine or potassium fluoride, and use of dichloromethane gave satisfactory results. 

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

Perfluorosuccinic acid (Tetrafluorobutanedioic acid) [377-38-8] (HOCO.CF2-)2 Caesium fluoride, Fluorine See Fluorine Caesium fluoride, etc. See other organic acids c4h2f4o2... 

The trifluorophosphorane (120) with caesium fluoride gave the salt (121) and with trimethylphosphine gave the six-co-ordinate species (122), whose configuration was shown by 19F n.m.r. spectroscopy.70... 

Of particular note is the report by Butler et al. of the generation of 3,4-diarylfurazan 7V-methanides (92) <95JCS(P1)1083>. These were formed (Scheme 15) as transient intermediates by desilylation of 7V-trimethylsilylmethyl-l,2,5-oxadiazolium salts (93) using caesium fluoride, and subsequently underwent rapid ring expansion to 6//-1,2,4-oxadiazines. Methanide (92) also resulted from treatment of A-methylfurazan salt (94) with base. 

O.P.A. Floyte, J. Emsiey, Caesium fluoride solutions in carboxylic acids, J. Chem. Soc. Dalton Trans. (1976) 2219-2226. 

Butler and co-workers studied the quatemisation of 3,5-diaryl-l,2,4-thiadiazoles 77 with trimethylsilylmethyl triflate at 40 °C and observed reaction at N-2 to give salt 78. Desilyation of 78 with caesium fluoride resulted in ring expansion to 2ff-l,3,5-thiadiazines 79 which on heating in ethanolic sodium ethoxide gave 2,4-... 

Trifluoromethyl hypofluorite was first made by Cady by passing methanol [184] or carbon monoxide [185, 186] with fluorine over silver difluoride at elevated temperatures. Later, trifluoromethyl hypofluorite and higher perfluoroalkyl hypofluorites were prepared by treating the appropriate carbonyl compound with fluorine in the presence of dry caesium fluoride at sub-zero temperatures (Fig. 81) [187-189]. 

I -Bromo-2-f-butyldimethylsilyloxyiiidencs (50) react with caesium fluoride to form inden-2-ones (51), which may dien be efficiently trapped in both inha- and inter-molecular additions.52... 

In a similar catalysed reaction alkenes are produced by the addition of monosilylated derivatives 168 to aldehydes in the presence of a catalytic amount of caesium fluoride in dimethyl sulphoxide (equation 138)210. 

The Suzuki cross coupling product 151 obtained from 150 and o-bromobenzaldehyde on exposure to caesium fluoride furnished, via in situ capture of the resulting carbanion 152 by the proximate aldehyde group, the Peterson elimination product, the enamine 153 in 54% yield. 

Caesium dodeca(trifluoromethyl)carbadodecaborane(14)[l-], see Caesium dodecakistrifluoromethylcarba-cfoso-dodecaborate, 3589b Caesium fluoride, 4249 Caesium fluoroxysulfate, 4250 Caesium graphite, 2877 Caesium hexafluorobromate, 0236 Caesium hexahydroaluminate(3—), 0067 Caesium hydride, 4252 Caesium hydrogen xenate, 4253 Caesium lithium tridecahydrononaborate, 0194 Caesium nitrate, 4255 Caesium nitride, 4260 Caesium oxide, 4258... 

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