Trisulfonated trisodium salt

The in situ formation of Pd(0) complexes takes place when Pd(OAc)2 is associated with various phosphines (i) aromatic phosphines (p-Z—C6H4)3P (Z = EDG or EWG). The formation of the Pd(0) complex follows a Hammett correlation with a positive slope [20]. The more electron-deficient the phosphine, the faster the reduction process this is in agreement with the intramolecular nucleophilic attack of the acetate onto the ligated phosphine as proposed in Scheme 1.13 (ii) aliphatic phosphines [20] (iii) water-soluble phosphines, triphenylphosphine trisulfonate (trisodium salt) [25] and triphenylphosphinetricarboxylate (trilithium salt) [26]. One major exception is the tri-o-tolylphosphine P(o-Tol)3, which cannot reduce Pd(OAc)2 to a Pd(0) complex in DMF or THE. Instead, an activation of one C-H bond of the tolyl moieties by Pd(OAc)2 takes place, leading to a dimeric P,C-palladacycle (see Section 1.5), as reported by Herrmann et al. in 1995 [27]. Such a Pd(ll) P,C-palladacycle catalyses Mizoroki-Heck reactions [27]. It is, however, a reservoir of a Pd(0) complex, as recently established by d Orly6 and Jutand [28] in 2005 (see Section 1.5). 

Fig. 1.5. Examples of hydrophobic, hydrophilic and amphiphilic probes. 1 pyrene. 2 8-hydroxypyrene-l,3,6-trisulfonic acid, trisodium salt (pyranine). 3 8-alkoxypyrene-l,3,6-trisulfonic acid, trisodium salt. 4 1-...

Ertekin and coworkers developed an additional optical COj sensor based on the fluorescence signal intensity changes of the pH-sensitive fluorescent dye 8-hydroxypyrene-l,3,6-trisulfonic acid trisodium salt (HPTS) dissolved in ILs [18]. When HCO3 was added to HPTS solution, the fluorescence intensity of the peak centered around 520 nm decreased by 90% in [C4Qlm] [BF4] and by 75% in [C4Cilm]Br. The reported detection limit for CO2 (g) was 1.4% while the detection limit for dissolved COj was 10 M HCO3. The sensor exhibited excellent stability and repeatability over a time period >7 months. 

The samples used were 10"5 M aqueous solutions of 8-hydroxypyrene-I,3,6-trisulfonic acid trisodium salt (HPTS or 3sPyOH) (Sigma-Aldrich) in buffers of pH 6 and pH 10. UV-Vis absorption spectra of the dye solutions at different pH environments were obtained with a Hitachi U-4001 uv-vis spectrophotometer. 

Bailey et al. (199) and Singh (200) used ion-exchange HPLC for the separation of amaranth from the intermediates naphthionic acid and R-salt, as well as the side reaction products 2-naph-thol-6-sulfonic acid sodium salt (Schaeffer s salt), 2-naphthol-6,8-disulfonic acid disodium salt (G-salt), and 2-naphthol-3,6,8-trisulfonic acid trisodium salt (NTSA). 

TPPTS triphenylphosphine-3,3 ,3 -trisulfonic acid trisodium salt... 

In addition to pyridinium based catalysts and cyclodextrin derivatives, some special compounds have also been reported to be useful inverse PT catalysts for specific reactions. Te-tramethyl ammonium salts that are ineffective as PT catalysts due to their high solubility in the aqueous phase have been found to be effective inverse PT catalysts in some systems. Some metal compounds like platinum, palladium, and rhodium can strongly complex with water-soluble ligands such as the trisodium salt of triphenylphosphine trisulfonic acid, and act as effective inverse PT catalysts. These complexes are soluble in the aqueous phase only and, thus are easily recov-... 

Acid blue 92 [4-((4-anilino-5-sulfo-l-naphthyl)azo-5-hydroxy-2,7-naphthalene-disulfonic acid trisodium salt, trisodium 4 -anilino-8-hydroxy-1,1 -azonaphthalene-3,6,5-trisulfonate, benzyl blue R, Cl 13390] [3861-73-2]... 

Synonyms Acid blue 92, trisodium salt Anazolene, sodium 4 -Anilino-8-hydroxy-1,1 -azonaphthalene-3,5, 6-trisulfonic acid trisodium salt 4-((4-Anilino-5-sulfo-1-naphthyl) azo)-5-hydroxy-2,7-naphthalenedisulfonic acid trisodium Cl 13390 Cyanine acid blue R 4-Hydroxy-5-[[4-(phenylamino)-5-sulfo-1-naphthalenyl] azo]-... 

Synonyms Cl 16255 Coccine Coccin red Cochineal Red A Food red 7 7-Hydroxy-8-[(4-sulfo-1 -naphthalenyl) azo]-1,3-naphthalenedisulfonic acid, trisodium salt 1,3-Naphthalenedisulfonic acid, 7-hydroxy-8-[(4-sulfo-1-naphthalenyl) azo]-, trisodium salt 1,3-Naphthalenedisulfonic acid, 7-hydroxy-8-((4-sulfo-1-naphthyl) azo)-, trisodium salt New coccine Ponceau 4R 1 -(4-Sulfo-1 -naphthylazo)-2-naphthol-6,8-disulfonic acid, trisodium salt SX purple Trisodium 1-(1-naphthylazo)-2-hydroxynaphthalene-4, 6,8-trisulfonate Classification Monoazo color azobenzene Empirical C2oHi4N2Na30ioS3 Properties M.w. 607.51... 

D C Red No. 2 Fast red FD C Red No. 2 Food red 2 Food red 9 2-Hydroxy-1,r-azonaphthalene-3,6,4-trisulfonic acid trisodium salt 3-Hydroxy-4-[(4-sulfo-1-naphthalenyl) azo]-2,7-naphthalenedisulfonic acid trisodium salt 3-Hydroxy-4-((4-sulfo-1 -naphthyl) azo)-2,7-naphthalenedisulfonic acid, trisodium salt Naphthol red Naphthylamine red... 

Hydroxy-3,4 -azodi-1-naphthalenesulfonic acid, disodium salt. SeeAcidred14 2-Hydroxy-1,1 -azonaphthalene-3,6,4 -trisulfonic acid trisodium salt. See Amaranth 2-Hydroxybenzaldehyde. See Salicylaldehyde 4-Hydroxybenzaldehyde. See p-Hydroxybenzaldehyde... 

Hydroxypyrene-1,3,6-trisulfonic acid, sodium salt. See Solvent green 7 8-Hydroxy-1,3,6-pyrenetrisulfonic acid trisodium salt. See Cl 59040 D C Green No. 8 Solvent green 7... 

Pyranine 1,3,6-Pyrenetrisulfonic acid, 8-hydroxy-, trisodium salt Trisodium 8-hydroxypyrene-1,3,6-trisulfonate... 

Our work [9-13] has centered on the dye molecule shown in Figure 1. This molecule is officially called 8-hydroxypyrene 1,3,6-trisulfonate and colloquially known as pyranine or HPTS. We also denote it by ROH. Dissolved as its trisodium salt, it is already triply charged in its ground state, where the pK value of the OH group is around 8. In the first excited singlet state the hydroxy group becomes highly acidic [5], with a pK value of 1.4. 

Figure 4 Catalytic Pauson-Khand reaction of an enyne in the presence of formaldehyde in wate as described by Fuji et al. Conditions enyne (0.25 mmol), formaldehyde (5 equivalents), [RhCl(cod)]2 (5mol%), dppp/TPPS (10mol%/10mol%), SDS (2 equivalents), H2O (1.9 mL), 100 °C, N2. cod, cyclooctadiene dppp, l,3-bis(diphenylphosphanyl)propane SDS, sodium dode-cylsulfate TPPTS, triphenylphosphane-3,3, 3"-trisulfonic acid trisodium salt.

The combination of water and an organic nitrile as the solvent system (aqueous bipha-sic system, ABS) permits one to separate the catalyst in the water solution, coordinated to a water-soluble phosphine, TPPTS, the trisodium salt of trisulfonated triphenylphos-phine.f" The groups of Sinou and Genet have studied this strategyy. " ° " ° Allylic carbonates are quite stable to the potentially hydrolytic conditions since the reactions occur in neutral medium and only traces of base are generated in the catalytic cycle. Organic-aqueous phase palladium catalysis has been reviewed extensively. 

Figure 5.22 Six carbohydrate receptors consisting of cationic bis-boronic acid appended benzyl viologens [3,3 -olm-, 4,3 -olm-, and 4,4 -o/m-BBV) and the anionic fluorescent dye 8-hydroxypyrene-l,3,6-trisulfonic acid trisodium salt (HPTS). Three corresponding benzyl viologens (3,3 -, 4,3 -, and 4,4 -BV) were used as controls.

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