Tetrabutyl ammonium tetrafluoroborate

In trifluoroacetic acid [0.4 M TBABF4 (tetrabutyl ammonium tetrafluoroborate)] unbranched alkanes are oxidized in fair to good yields to the corresponding triflu-oroacetates (Table 2) [16]. As mechanism, a 2e-oxidation and deprotonation to an intermediate carbenium ion, that undergoes solvolysis is proposed. The isomer distribution points to a fairly unselective CH oxidation at the methylene groups. Branched hydrocarbons are preferentially oxidized at the tertiary CH bond [17]. 

Unlike glass-ionomers or compomers, composite resins are not inherently fluoride-releasing and they do not generally contain any fluoride compounds. However, they can be formulated with such compounds [281], for example NaF, YbFs or ion-leachable glass [201]. Organic fluorides can be used, too, such as methacryloyl fluoride-methyl methacrylate (MF-MMA) or tetrabutyl ammonium tetrafluoroborate. These latter substances impart the property of slow release of fluoride to the surrounding tissue without the creation of voids within the material. 

Current density at a Cu cathode tetrabutyl ammonium tetrafluoroborate "1 atm. 40 atm electrolysis was conducted at 20 C, and thus the mole fraction was slightly larger than 0.33. 

Typical data are presented for the major products. BC Benzalconium chloride, HA Hydroxylamin, TBATF Tetrabutyl ammonium tetrafluoroborate, TEAB Tetraethyl ammonium bromide, TEAH Tetraethyl ammonium hydroxide, TEAP Tetraethyl ammonium perchlorate. Ppy Polypyrrole, PAn Polyaniline. 

FIGURE 4. Reduction of Ph2NTs in the presence of an excess of BPN in DMF/tetrabutyl-ammonium tetrafluoroborate. (From Reference 34). 

A new experimental arrangement is described whereby thin films (about 1 micrometre thick) of polypyrrole were electrochemically deposited onto a silicon rod single crystal that formed an element of the cylindrical internal reflectance accessory of an FTIR spectrometer. Polypyrrole was deposited from acetonitrile solutions of pyrrole in the presence of lithium perchlorate, tetrabutylammonium perchlorate and tetrabutyl-ammonium tetrafluoroborate. Excellent quality in situ... 

Self-doped polypyrrole was first prepared by Reynolds et al. [42] and Havinga et al. [43] in 1987. Their approach to self-doping of polymers was based on monomers that were easier to polymerize electrochemically. Reynolds et al. prepared the N-substituted pyrrole copolymer, poly(pyrrole-co-(3-(pyrrol-l-yl)propanesulfonate)) (Figure 5.1) in acetonitrile containing tetrabutyl ammonium tetrafluoroborate as a supporting electrolyte on a platinum electrode. The monomer, potassium... 

Methylene chloride/tetrabutyl-ammonium tetrafluoroborate Good... 

Half-wave potential (-E1/2) vs. saturated calomel electrode (SCE). Values vs. Ag AgCl or Fc /Fc have been converted to vs. SCE using a conversion factor of 0.045 V or 0.49, respectively [96]. bDMF = dimethylformamide, DMSO = dimethylsulfoxide, DCM = dichloromethane, DCB = dichlorobenzene, THF = tetrahydrofuran, TBAP = tetrabutyl ammonium perchlorate, TBABF4 = tetrabutylammonium tetrafluoroborate, t-butyl = tert-butyl... 

Abbreviations DMF, dimethylformamide MeCN, acetonitrile THF, tetrahydrofuran DMSO, dimethylsulfoxide PC, polycarbonate TBAI, tetrabutyl-ammonium iodide TBAP, tetrabutylammonium phosphate TBABF4> tetrabutylammonium tetrafluoroborate TRAP, tetraethylammonium phosphate. Vsersus Ag Ag+ (0.01 M) in NH3 at -50°C. Versus Ag AgN03 (sat d) in SO2 at -40°C. 

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