2.4- Dichloro-l-naphthol

Fig. 5-53. Separation of various mono- and polyvalent phenols. - Separator column Ion Pac NS1 (10 pm) eluent (A) 0.01 mol/L KH2P04 (pH 4.0) / acetonitrile (90 10 v/v), (B) 0.01 mol/L KH2P04 (pH 4.0) / acetonitrile (20 80 v/v) gradient linear, 15% B in 20 min to 55% B flow rate 1 mL/min detection UV (280 nm) injection volume 50 pL solute concentrations 100 ppm each of pyrogallic acid (1), resorcinol (2), phenol (3), o-cresol (4), 2,4-di-methylphenol (5), /J-naphthol (6), 2,4-dichloro-3-nitrophenol (7), and thymol (8).

Analytes of biological importance can also be detected with CNT-porphyrin nanoreactors. Thns, Sndan 1 (l-phenylazo-2-naphthol), a food coloring agent with metabolites associated with bladder cancer, could be detected in real samples nsing iron(ni) tetraphenylporphyrin-SWCNT systan to modify a glassy carbon electrode [232]. On the other hand, the herbicide 2,4-D (2,4-dichloro-phenoxyacetic acid) was selectively detected by a sensor made by modifying a carbon paste electrode with iron(llI) mc50-tetrakis(pentafluorophenyl)porphy-rin/MWCNT composite [233]. 

Naphthol 1-Naphthol 1-Naphthol 4-Chloro-l-naphthol 4-Chloro-l-naphthol 4-Chloro-l-naphthol l,4-Dichloro-2-naphthol EL, H O... 

Dichloro-2 -hydroxy-4-methyl-5 -ohloroa obensene Phenylaso l -naphthol-2 Salicylaldehyde-anil, 2-OHCtH[Pg.488]

The reaction of 3,3-dichloro-l,2-diphenylcyclopropene (24) with activated benzenoid or non-benzenoid aromatics, such as phenols, naphthols, anthracenols, or 4,6,8-trimethyl-azulene, in refluxing benzene afforded mixed triarylcyclopropenylium salts. 

Cl reactive red 2 [5-((4,6-dichloro-i-triazin-2-yl)amino)-4-hydroxy-3-(phenylazo)2,7-naphtahlenedisulfonic acid disodium salt, ostazin brilliant red S 5B] [17804-49-8] Sudan red [l-(2,4-xylylazo)-2-naphthol, l-xylylazo-2-naphthol, oil scarlet L, Cl solvent orange 7, Cl 12140] [3118-97-6] Acid red 37 [3-hydroxy-4-4-((4-sulfo-1-naphthyl)azo)-2,7-napthalenedisulfonic acid trisodium salt, acid amaranth 1, Cl 16185], [915-67-3]... 

The exit rate constants of the excited anions after the photoprotolytic dissociation of l,4-dichloro-2-naphthol within decylsulfate, dedecylsulfate, and cetylsulfate micelles were measured with a fluorescence quencher hardly penetrating the micelles, - the nitrate ion [121]. The addition of nitrate into the solution quenched the fluorescence of those anions which escape from the micelles within the lifetime of the excited state only. The exit rate constant of the naphtholate anion increases with increasing length of the hydrocarbon radical in the micelle-forming surfactant. The exit rate is thus controlled by the lowering of the micelle polarity (i.e. by the free energy of the exit process) rather than by the micelle size or the distance that the anion must diffuse. Perhaps one can establish a kind of correlation between the rate constant of this process and its free energy as was done for photochemical electron transfer [126] and proton transfer [156,157]. 

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