Sulfonated naphthalene analysis

Chem. Descrip. high m.w., sulfonated naphthalene condensate Chem. Analysis Water < 7%... 

To this mixture there is then added slowly over a period of 30 minutes 10 grams of - -)-a-aminobenzylpenicillin beta-naphthalene sulfonate. The mixture is agitated for 3 hours at 25°-30°C. The product, D- -)-o -aminobenzylpenicillin trihydrate precipitates and is collected by filtration. The filter cake of the product is washed several times with methyl isobutyl ketone and is dried at 40°C. The product is obtained in about a 90% yield and has a potency of 865 mcg/mg. It is determined by Karl Fischer analysis to have a moisture content of 13.4% by weight. 

Diederich and coworkers [10] synthesized so-called dendrophanes (Figure 13.6) containing a paracyclophane core embedded in dendritic poly(ether-amide) shells. X-ray crystal-structure analysis indicated that these dendrimers had an open cavity binding site in the center, suitable for the binding of aromatic guests. NMR and fluorescence titration experiments revealed a site specific binding between these dendrimers and 6-(p-toluidino)naphthalene-2-sulfonate (TNS) with a 1 1 association. Also, the fluorescence spectral shift of TNS, which is... 

Typical probes for the analysis of ionic solutes include 3-hydroxy-L-tyrosine (DOPA)24 and naphthalene-2-sulfonate,26 whereas those for use with uncharged solutes include nicotinamide,27 theophylline,28 and anthracene 29 Indirect detection is nonspecific and less suitable for the analysis of complex or impure samples, because unpurified biological samples, such as urine, contain a large number of hydrophilic solutes that will give problems such as extra system peaks. However, analyses of pharmaceutical products and quantification of impurities in substances are typical of applications.23... 

The application of MIPs as the stationary phase in solid-phase extraction (SPE), often referred to as molecularly imprinted polymer solid-phase extraction (MIS P E), is a rapidly growing area [197-199]. With MISPE, highly specific enrichment of substances present at trace levels is possible. The technique has been applied to the analysis of drugs, for example, caffeine [200], scopolamine [201], naproxen [202], tetracycline [203], cholesterol [204] and local anesthetics [205], as well as environmental pollutants, exemplified by organophosphate flame retardants [206-208], triazines in soil and vegetable samples [71] and naphthalene sulfonates in river water [209]. 

The formation of anionic polyelectrolyte layers on the surfaces of anion exchange membranes provides ionic cross-linkage and excess anionic charge on the membrane surfaces. Figure 5.25 shows the distribution of sulfur, based on sulfonate groups, for a cross-section of a membrane, measured by EPMA (Electron Probe Micro Analysis), when a strongly basic anion exchange membrane was immersed in an aqueous 200 ppm solution of the polycondensation product of sodium naphthalene sulfonate and formaldehyde for 17 h (sharp... 

The variety of applications of ion-pair chromatography illustrates the versatility of this technique in separation science. Early applications utilized a normal-phase solid support and explored the resolution of amines and alkyl ammonium ions with an anionic counter ion such as picrate or naphthalene 2-sulfonate (41, 42, 89, 90, 219). These results prompted investigations into the suitability of ion-pair chromatography as a technique for use in pharmaceutical analysis such as the determination of ergot alkaloids (333). 

The Food and Drug Administration have written numerous articles pertinent to the spectrophotometric analysis of certifiable dyes. Examples are the identification of azo dyes by ultraviolet analysis of their reduction products the ultraviolet determination of sul-fonated naphthalene intermediates in certifiable coal tar colors the ultraviolet analysis of commercial ethylbenzylaniline sulfonic acid... 

The relative ease of sulfonation of 235 in comparison with chalcone 231 is due to the greater reactivity of the naphthalene nucleus towards electrophilic substitution and the orientation of sulfonation occurs in the predicted 4-position of the naphthalene ring in view of the electron-donating character of the alkenic double bond. 2-, 3-, and 4-Methoxy, 3,4-dimethoxy- and 4-phenyl-chalcone, together with the 2-thienyl and cinnamylidene analogues reacted with chlorosulfonic acid (six equivalents or three equivalents in thionyl chloride) at room temperature to give the corresponding sulfonyl chlorides. The orientation of sulfonation was discussed in terms of stereoelectronic factors and was confirmed by NMR spectral analysis. 

Storage 720 days Supragil NK [Rhodia Novecare] them. Descrip. Sodium dibutyl naphthalene sulfonate Ionic Nature Anionic Chem. Analysis 5% max. moisture CAS 25417-20-3... 

Chem. Descrip. Sodium methyl naphthalene formaldehyde sulfonate, sodium sulfate, and water Ionic Nature Anionic Chem. Analysis 8% max. water CAS 9084-06-4 7757-82-6 EINECS/ELINCS 231-820-9 Uses Dispersant, compatibility agent for suspension cones., suspo-emulsions, water disp, grans., wettable powds. 

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