O Nitroaniline hydrochloride

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... 

Chaube et al. [47] investigated the determination of ultratrace concentrations of nitrite in sulfuric acid extracts in soil. In their method, the nitrite is used to diazotise o-nitroaniline and the o-nitrophenyldiazonium chloride produced is coupled with N-naphlhylcthylcncdiaminc hydrochloride. The red-violet dye produced is extracted into isoamyl alcohol and evaluated spectrophotometrically at 545 nm. Beer s law is obeyed in the range 0.1 to 0.6 mg nitrate per litre of solution. 

Cl 37100. See 2-Methyl-4-nitroaniline Cl 37105. See 2-Methyl-5-nitroaniline Cl 37107. See p-Toluidine Cl 37110. See 3-Nitro-p-toluidine Cl 37115. See o-Anisidine hydrochloride Cl 37130. See 2-Methoxy-5-nitroaniline Cl 37225. See Benzidine Cl 37230. See o-Tolidine Cl 37235. See Dianisidine Cl 37240. See N-Phenyl-p-phenylenediamine Cl 37500. See P-Naphthol Cl 40000. See Direct yellow 11 Cl 40002 Cl 40003. See 4,4 -Diaminostilbene-2,2 -disulfonic acid Cl 40645. See Sodium-2-(4-styrvl-3-sulfophenyl)-2H-naphtho-(1,2-d)-triazole Cl 40800... 

Cl azoic diazo component 11. See 4-Chloro-o-toluidine hydrochloride Cl azoic diazo component 12. See 2-Methyl-5-nitroaniline... 

Riegelmann et al. [93] studied various aromatic compounds solubilized in aqueous solutions of potassium laurate, dodecylamine hydrochloride, and a polyoxyethylene ether of dodecanol (Brij 35). The ultraviolet spectra of ethylbenzene in these micellar solutions were very similar to those in non-polar solvents (see Fig. 5.10) and it was concluded that this solubilizate resided completely in the micellar core. Some regions of the spectra of solubilized naphthalene, anthracene and azobenzene, on the other hand, showed similarities with the spectra of these compounds in water, whilst other regions resembled the spectra in non-polar solvents. The suggestion was made that these compounds were solubilized in such a way as to be in partial contact with both the polar micellar surface and the non-polar micellar core, i.e. a position of deep penetration. By similar reasoning it was concluded that o-nitroaniline was located at a position of short penetration whereas dimethylphthalate, whose spectrum closely resembled the spectrum in water, was thought to be adsorbed on the micellar surface. 

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