2,7-Naphthalenedisulfonic acid, 4,5-dihydroxy

AI3-18239 Chromotropic xid 4,5-Dihydroxy-2,7-naphthalenedisulfonic acid 4,5-Dihydroxynaphth-alene-2,7-disulphonic acid EINECS 205-712-7 2,7-Naphthalenedisulfonic acid, 4,5-dihydroxy-, An acid dye for wool. Needles or leaflets, 7-k = 235, 312, 332, 348 nm (e = 79433, 6310, 7943, 10000, pH 0.75) soluble in H2O, alkali, insoluble in EtOH, Et20. [Pg.144]

SPADNS is the acronym for the sodium salt of 2-(4-sulfophenylazo)-l,8-dihydroxy-3,6-naphthalenedisulfonic acid. [Pg.396]

With azo dyes derived from 4,5-dihydroxy-2,7-naphthalenedisulfonic acid [148-25-4] (chromotropic acid) as the coupling component, metal complex formation occurs with the perihydroxy groups without oxidation. [Pg.438]

Gronsberg reported procedures in which vinyl acetate trapped from air was oxidized with potassium permanganate to formaldehyde, which was quantified using chromotropic acid (4,5-dihydroxy-2,7-naphthalenedisulfonic acid) (7, 8). The lower analytical limit for vinyl acetate was given at 2.5 yg. [Pg.170]

Interesting calixarenes and calixarene-related compounds have been obtained in one-step reactions from 1-naphthol, from the naphthalenediol disulfonate 11, and from and the bis-phenols 13, 15, and 17. Although 2-naphthol reacts with formaldehyde to yield a simple bis-naphthol, 1-naphthol produces a mixture containing 9.6% of the symmetrical cxo-OH cyclic tetramer 10 accompanied by 5% and 16% of two other cyclic tetramers in which the naphthol residues are unsymmetrically placed in the cyclic array. When the disodium salt of 1,8-dihydroxy-3,6-naphthalenedisulfonic acid (chromotropic acid) (11) is treated with an aqueous solution of formaldehyde and the mixture is allowed either to stand at room temperature for a week or is refluxed 6 h, a high yield of the endo-OH cyclic tetramer 12 is formed. The ease with which this condensation occurs is surprising in view of the deactivating effect of the sulfonic acid groups... [Pg.12]

The superiority of the negative-ion mode was also clear from the FD mass spectra of 9a and 17 and of the potassium salts of benzenesulfonic acid, 1-methylphenanthrenesulfonic acid and perylenesulfonic acid13,29, where the unclustered anions were the only significant species desorbed from the respective salts, dissolved in a polyethylene oxide matrix. Only weak negative-ion signals could be obtained from the application of electrodynamic ionization mass spectrometry to the disodium salts of 2-naphthol-3,6-disulfonic acid (24a) and of 4,5-dihydroxy-2,7-naphthalenedisulfonic acid (24b)30. [Pg.82]

SPADNS also known as 4,5-dihydroxy-3-(2-hydroxy-5-sulfophenylazo)-2, 7-naphthalenedisulfonic acid]... [Pg.361]

Dimethyl (1,1 -biphenyl)-4,4 -diyl) bis (azo)) bis (4-amino-1-naphthalenesulfonic acid), disodium salt. See Direct red 2 3,3 -[(3,3 -Dimethyl [1,1 -biphenyl]-4,4 -diyl) bis (azo)] bis [4,4-dihydroxy-2,7-naphthalenedisulfonic acid tetrasodium salt. See Direct blue 25... [Pg.1407]

Sodium 4,5-dihydroxy-2,7-naphthalenedisulfonic acid Chromotropic acid disodium salt CioHsNajOsSj 129-96-4 364.260 wh nd or If (w) vs H 0... [Pg.629]

Dihydroxy-3-[ 2-hydroxy-5-sulfophenyl)azo]-2J-naphthalenedisulfonic acid. 7- 2-Hydroxy-5-sulfophenylazo) chromotropic acid. C.I. Mordant blue 31. C.L 16675 [25849-37-0]... [Pg.11]

Bis[ 2,3-dihydro-1,5-dimethyl-3-oxo-2-phenyl-lH-pyrazol-4-yl)azo]-4,5-dihydroxy-2,7-naphthalenedisulfonic acid, 9CI. Antipyrine S. Diantipyrylazo [14918-39-9]... [Pg.75]

Arsonophenyl)azo]-1,8-dihydroxy-3,6 disulfo-2-naphthalenyl azd -l,3-naphthalenedisulfonic acid, 9CI. i-[(2-Arsonophenyt)azd -4,5 dihydroxy-6-[ l,3-disulf0-7 naphthyl) azo]-2,7-naphthalenedisulfonic acid, SCI [37465-96-6]... [Pg.77]

Arsonophenyl)azo 6-[(2y6-dibromo-4-sulfopheny[)azo]-4,5-dihydroxy 2J-naphthalenedisulfonic acid, 9CI [94779-97-2]... [Pg.78]

Arsonophenyt)azo]-4,5-dihydroxy-6-[5-fiA,W-dimethylsulfonamido)-2-methoxy]-2,7-naphthalenedisulfonic acid... [Pg.79]

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