Borofluoride, sodium

Apreton R Borate(l-), tetrafluoro-, sodium Boron sodium fluoride (BNaF4) EINECS 237-340-6 NSC 77386 Pyricit Sodium borofluoride Sodium boron fluoride Sodium boron tetrafluoride Sodium fiuoborate Sodium fluoborate (Na(BF4 Sodium fluoroborate (NaBF4) Sodium tetrafluoroborate Sodium tetrafluoroborate 1-). Used as a fluorinating agent. Rectangular prisms mp = 384° = 2.4700 soluble in H2O (108 g/100 ml), less... 

By adding a concentrated solution of sodium borofluoride to a solution of a diazonium salt, the diazonium fluoborate is precipitated this decomposes into the aryl fluoride when cautiously heated, for example ... 

Difluorodiphenyl. Bis-diazotise a solution of 46 g. of benzidine (Section IV,88) in 150 ml. of concentrated hydrochloric acid and 150 ml. of water by means of a solution of 35 g. of sodium nitrite in 60 ml. of water add about 200 g. of crushed ice during the process (compare p-Fbtorotoluene above). Filter the solution and add it to a filtered solution of 85 g. of sodium borofluoride in 150 ml. of water. Stir for several minutes, collect the precipitated bis-diazonium borofluoride by suction filtration, wash with 5 ml. of ice-cold water, and dry at 90-100°. Place the dry salt in a flask fitted with an air condenser, immerse the flask in an oil bath, and slowly raise the temperature to 150° (Fume Cupboard ). When decomposition of the salt is complete, steam distil the mixture collect the 4 4 difluoro-diphenyl which passes over and recrystallise it from ethanol. The yield is 21 g., m.p. 92-93°. 

Dissolve 34 g. of o-nitroaniline in a warm mixture of 63 ml. of concentrated hydrochloric acid and 63 ml. of water contained in a 600 ml. beaker. Place the beaker in an ice - salt bath, and cool to 0-5° whilst stirring mechanically the o-nitroaniline hydrochloride will separate in a finely-divided crystalline form. Add a cold solution of 18 g. of sodium nitrite in 40 ml. of water slowly and with stirring to an end point with potassium iodide - starch paper do not allow the temperature to rise above 5-7 . Introduce, whilst stirring vigorously, a solution of 40 g. of sodium borofluoride in 80 ml. of water. Stir for a further 10 minutes, and filter the solid diazonium fluoborate with suction on a sintered glass funnel. Wash it immediately once with 25 ml. of cold 5 per cent, sodium borofluoride solution, then twice with 15 ml. portions of rectified (or methylated) spirit and several times with ether in each washing stir... 

Silver Tetrafluoroborate. Silver tetrafluoroborate [14104-20-2], AgBF, is formed from silver borate and sodium borofluoride or bromine trifluoride. It is soluble in organic solvents. 

Nitrophenylarsonic acid has been prepared by heating p-nitrobenzenediazonium chloride with arsenious acid in hydrochloric acid, by the action of -nitrobenzenediazonium chloride on sodium arsenite, by the action of sodium arsenite on sodium -nitrobenzeneisodiazo oxide, by the diazotization of -nitro-aniline in acetic acid in the presence of arsenic chloride and cuprous chloride, and by the reaction of -nitrobenzenediazonium borofluoride with sodium arsenite in the presence of cuprous chloride. ... 

Under suitable conditions, further oxidation of the coupled products produces isolable dimer cation radicals. Thus treatment of 9-alkylcarbazoles with lead tetracetate in acetic acid-perchloric acid, or with 2,3-dichloro-5,6-dicyano-p-benzoquinone in acetic acid-perchloric acid, or with tris-(p-bromophenyl)ammoniumyl perchlorate in methylene chloride, or with nitrosonium borofluoride in acetonitrile all gave isolable cation radical perchlorates such as 17. These were reducible with aqueous sodium dithi-onite to the corresponding bicarbazoles the dimer cation radicals could be produced again by reoxidation of the dimer using 2,3-dichloro-5,6-dicyano-p-benzoquinone in acid solution. ... 

Fluoroborate (or Gluoborate) of Sodium. See Sodium Borofluoride in this Section... 

The most recent modification of Bart s reaction involves the use of aryldiazonium borofluorides in place of the customary diazonium chlorides. Because of their increased stability the diazonium borofluorides were observed to have less tendency to decompose or to form byproducts when allowed to react with sodium arsenite furthermore, the reactions could be carried out at room temperature. The modification appears to be particularly useful in the preparation of p-nitrophenylar-sonic acid, the yield being 79% as compared with 45% by the original method of Bart. When other diazonium borofluorides were used as starting materials the yields were sometimes lower than those reported by the usual Bart procedure, but more often they were as good or slightly... 

Preparation. One mole of triethyloxonium fluoroborate (I) is covered with dimethylformamide in a flask cooled in salt-ice, and the mixture is stirred vigorously under reflux. A vigorous reaction is soon over, and dimethylaminoethoxycarbonium fluoroborate (2) separates as a lower layer. This is separated and added dropwise to a solution of sodium ethoxide in ethanol. The sodium borofluoride which separates is removed, and the acetal (3) is separated by fractionation. 

Figure 2.42. The F spectrum of sodium borofluoride in D2O. The "BF4 ion produces the even quartet (" B I =...

Sodium borofluoride 3432 Sodium fluoride cyclic dimer 3431... 

Boron trichloride is prepared by chlorinating a mixture of finely divided carbon and boric oxide at 1600°F to 1800°F (871°C to 982°C). It can also be prepared by heating boric oxide with sodium, potassium, or lithium chloride at 1472°F to 1832°F (800°C to lOOOX) or by heating sodium borofluoride with magnesium chloride at 932°F to 1832°F (500 C to 1000°C) [9]. 

---