1- naphtol

SOLID-PHASE EXTRACTION ON SIMULTANEOUS SPECTROPHOTOMETRIC DETERMINATION TRACE IONS IN WATER WITH l-(2-PYRIDILAZO)-2-NAPHTOL... 

RajanBabu reported the first preparation of a bis-imidazolium salt 15 bearing a chiral linker (Scheme 11). The starting material was the enantiomerically pure (S)-l,l -bi-2-naphtol bis(trifluoromethanesulfonate) which was transformed in two steps into the dibromomethyl derivative 16 and then into the bis-imidazole. Quaternarization of this compound afforded 15 [20]. 

Acid Orange 7 Sludge originally collected from a pulp and paper wastewater treatment plants Color removal of 96% was achieved in the presence of liposomes that facilitated uptake of dyes by anaerobic biomass, leading to a fast decolorization. Amines such as sulfanilic acid and aniline were mineralized by inocula with high microbiological diversity, even with domestic effluent. Orthanilic and metanilic acids and 1-amino-2-naphtol were persistent under tested conditions [176]... 

Fig. 3.38.The IUPAC names of Sudan azo dyes are as follows Sudan 1 = 1— [(2,4-dimethylphenyl)azo]-2-naphtalenol Sudan II = l-(phenylazo)-2-naphtol Sudan III = l-(4-phenylazophenylazo)-2-naphtol Sudan IV = o-tolyazo-o-tolyazo-beta-naphtol and Disperse Orange 13 = 4-[4-(phenylazo)-l-naphtylazo]-phenol. Azo dyes were separated in an ODS column (250 x 2.1 mm i.d. particle size 5 /xm) at 35°C. The isocratic mobile phase consisted of 0.1 per cent formic acid in methanol-0.1 per cent formic acid in water (97 3, v/v). The flow rate was 200 /xl/min. MS conditions were nebulizing and desolvation gas were nitrogen at the flow rates of 50 and 5551/h, respectively electrospray voltage, 3.0 kV cone voltage 25 V source temperature, 110°C desolvation temperature, 110°C. Azo dyes were extracted from the samples by homogenizing 1 g of sample with 10 ml of acetone, then the suspension was centrifuged and an aliquot of 3 ml of supernatant was mixed with 1 ml of deionized water, filtered and used for analysis. LC-ESI-MS/Ms SRM traces of standards and spiked samples are listed in Fig. 3.39. It was found that the detection and quantitation limits depended on both the chemical structure of the dye and the character of the accompanying matrix. LOD and LOQ values in chilli tomato sauce...

Fig. 3.127. Representative coupling reaction between PNBD and the sodium salt of 2-naphtol-6-sul-phonic acid to yield the 6-sulphonate-2-naphtol-l-azo-p-nitrobenzene azo dye. Reprinted with permission from C. Bravo-Diaz et al. [177],...

Decalin. Decalin was chosen to study the reactivities and selectivities of and a-(5 disubstituted cyclohexane ring as well as the influence of the adjonction of a second saturated Cf, ring. The cis- and trans-isomers were photoxidized in the same conditions. The cis-isomer was found at least 10 times more reactive with a selectivity of 81% in mild oxidation products and 19% in CO2. The following relative selectivities for the main mild oxidation products (2-decalone, with small amounts of 1-decalone and 2-decalol (decahydro-2-naphtol) were found ... 

For the systems curium/inorganic ligands studied, on the other hand, the Afapp values derived by TRES are proportional to K rather than to K (see eq. (27)). To our knowledge, no simple relationship between K and K has been derived for 5f elements and the assumption K K simply relies on the similarities in the chemistry of 4f and 5f elements, a point which does not appear to be straightforward (Choppin, 1983). However, the question of a difference between K and K is not unimportant, as this difference can be very large in some systems, e.g., K = 1CT2-8 and K = 10-9-5 for deprotonation of 2-naphtol (Laws and Brand, 1979). 

Fig. 6.7. Separation of a mixture of polar and nonpolar aromatic compounds by CEC. Conditions capillary 27 cm x 75 pm i.d.For details on monolith column see Fig. 6.6 mobile phase 1 3 methanol/acetonitrile, 30kV, 25°C, injection 10 kV for 3s UV- detection at 200 nm. (Reprinted with permission of authors from [32]). Peaks pyrene 1, phenanthrene 2, anthracene 3, phenol 4, hydroquinone monomethylether 5, 2-naphtol 6, catechol 7, hydroquinone 8, resorcinol 9.

Starting with l,l/-methylene-di(2-naphtol) 13 and 5-nitro-phthalonitrile 12, bis-phthalonitrile 14 was prepared. To obtain metal-free ball-type Pc 15, a suspension of 14 in dry amyl alcohol and lithium metal was heated in a sealed tube at 170°C for 8 h, Fig. 4. The metallo Pcs with zinc 16 and cobalt 17 were synthesized by heating a... 

Figure 1.7 shows both the experimental and predicted values (continuous line) of both the ICE and COD evolution with the specific electrical charge passed during the anodic oxidation of different classes of organic compounds (acetic acid, isopropanol, phenol, 4-chlorophenol, 2-naphtol). This figure demonstrates that the... 

Fig. 1.7 Evolution of COD and ICE inset) in function of specific charge for different organic compounds (cross) acetic add, (open square) isopropanol, (open circle) phenol, (open triangle) 4-chlorophenol, (open diamond) 2-naphtol i = 238 A m-2 T = 25°C Electrolyte 1M H2SO4. The solid line represents model prediction...

The influence of current density on both ICE and COD evolution with the specific electrical charge passed during the galvanostatic oxidation of a 5 mM 2-naphtol in 1M H2S04 at different current densities (119 — 476 A m-2) is shown in Fig. 1.9. As previously noted, an excellent agreement between the experimental and predicted values is observed. 

Fig. 1.9 Influence of the applied current density (cross) 119 A m 2, (open circle) 238 A m 2, (open diamond) 476 A m 2 on the evolution of COD and ICE (inset) during electrolysis of 5 mM 2-naphtol in 1 M H2S04 on BDD T = 25°C. The solid line represents model prediction...

If bi-2-naphtol was stereoselectively oxidized, the kinetic resolution of bi-2-naphthol was achieved. Actually, the S enantiomer of bi-2-naphtol is more rapidly consumed than the R enantiomer with an enantiomer excess of 15.2% after 1 h and 2 h reactions and 11.0% after a 12 h reaction. 

They set up the catalytic reaction system depicted in Scheme 13. [Ru(menbpy)3]3 + is generated by oxidative quenching of [Ru(menbpy)3]2 + by the oxidant [Co(acac)3] (40, Hacac = pentane-2,4-dione). By oxidation of binaph-thol 38, [Ru(menbpy)3]3 + is converted to [Ru(menbpy)3]2 +. The oxidation products have not been established yet. With chiral A-[Ru(menbpy)3]3+ (S)-( — )-l,l -bi-2-naphtol (38) was converted faster than the (/ )-(+) enantiomer ent-38), so that after 3 h binaphthol ent-38 was obtained in 15% ee. 

Watanabe, H., Tanaka, H. Anon-ionic surfactant as a new solvent for liquid-liquid extraction of zinc (11) with l-(2-pyridylazo)-2-naphtol. Talanta 25, 585-589 (1978)... 

NAPHTOL (FRENCH) see NAXOOO P-NAPHTOL (GERMAN) see NAXOOO NAPHTOL AS-KG see TGROOO NAPHTOL AS-KGLL see TGROOO NAPHTOX see AQN635... 

MajlSt worked out a gas chromatographic assay of atropine and phenobarbital in pharmaceutical preparations containing Valeriana liquid extract. After extraction of atropine, it was hydrolyzed and the free tropic acid silylated with N,0-bis(trimethylsilyl(acetamide. The assay was performed on a glass column, 1 m long by 3 mm I.D. packed with 1.5 % OV-101 on silanized Gas Chrom P, 100-120 mesh, at 140°C, using silylated 2-naphtol as an internal standard. 

Kamegawa, K., Nishikubo, K., Kodama, M., et al. (2003). Dissolution-aggregation behaviour of water-soluble nanographites and their adsorptive characteristics for 2-naphtol in aqueous solutions. J. Colloid Interface Sci., 268, 58—62. 

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