The reaction between phenol and nitric acid requires concentrated sulfuric acid and varies depending on the concentration of nitric acid. Dilute nitric acid typically results in monosubstitution, whereas concentrated nitric acid is needed to produce the trinitro molecule. The reaction also produces water...
Gen-sheng Yang,Jie-hua Shi,Jinghua Li.  Selective nitration of phenol to ortho-nitrophenol using dilute nitric acid by microemulsion of cetytrimethylammonium bromide (CTAB) in isooctane[J]. Korean Journal of Chemical Engineering . 2003 (5)...
The slow conversion of 7,8-dihydro-6-hydroxymethylpterin in TFA into (149) and 7,8-dihydro-6-methylpterin is the result of an intermolecular redox reaction 〈84C429〉. In a more complex case 7,8-dihydrobiopterin (150) is converted in dilute acetic acid into a mixture consist...
If the phenothiazine is not dissolved in concentrated sulfuric acid but is added to a solution of the p-nitrosophenol in a more diluted sulfuric acid, the radical cation is formed only slowly through reaction with the dilute sulfuric acid and a larger excess of p-nitroso-phenol is requisite....
The 2,4-dinitro-6-alkyl-phenols can be prepared by reacting a 6-alkyl-phenol with concen25 trated sulphuric acid until the phenol is converted substantially to a sulphonic acid derivative. This reaction product is then dissolved in water, and sufficient nitric acid is gradually added to the ...
hydroxide followed by acidification; the hydrolysis of chlorobenzene by dilute sodium hydroxide at high temperature and pressure to give sodium phenate, which on acidification liberates phenol (Dow process); or the catalytic vapor-phase reaction of steam and chlorobenzene at 500°C (Raschig process)...
The paper reports near-selective nitration of phenol to ortho -nitrophenol using a suitably prepared microemulsion solution in the presence of dilute nitric acid. The case example indicates that microemulsions, besides enhancing the reaction rates, can also be selective to give the desired product. ...
A PROCESS FOR THE PREPARATION OF O-NITRO-PHENOL BY SELECTIVE NITRATION OF PHENOL USING MICROEMULSION AND DILUTE NITRIC ACIDAJYA SADASHIV CHHATRERAMESH ANNA JOSHIBHASKAR DATTATRAYA KULKARNI
hydroxide followed by acidification; the hydrolysis of chlorobenzene by dilute sodium hydroxide at high temperature and pressure to give sodium phenate, which on acidification liberates phenol (Dow process); or the catalytic vapor-phase reaction of steam and chlorobenzene at 500°C (Raschig process)...