CAS No 6372-96-9 , Benzenesulfonic acid,5-chloro-2-[4,5-dihydro-3-methyl-4-[2-[4-[[(4-methylphenyl)sulfonyl]oxy]phenyl]diazenyl]-5-oxo-1H-pyrazol-1-yl]-,sodium salt (1:1)

Name: Benzenesulfonic acid,5-chloro-2-[4,5-dihydro-3-methyl-4-[2-[4-[[(4-methylphenyl)sulfonyl]oxy]phenyl]diazenyl]-5-oxo-1H-pyrazol-1-yl]-,sodium salt (1:1)
Synonyms: C.I. 642; Japan Yellow 402; Erionyl Yellow 2G; Polar Yellow 5G; Milling Yellow E; Acid Leather Yellow GR; Vondamol Fast Yellow 2G; Elite Fast Yellow 2G; CalcocidMilling Yellow 2GC; C.I. 18950; Yellow 402;Benzenesulfonicacid,5-chloro-2-[4,5-dihydro-3-methyl-4-[[4-[[(4-methylphenyl)sulfonyl]oxy]phenyl]azo]-5-oxo-1H-pyrazol-1-yl]-,sodium salt (9CI); Ext D and C YellowNo. 4; Japan Yellow No. 402; Triacid Fast Yellow 5G; Polar Yellow 5GL;Benzenesulfonic acid,5-chloro-2-[4,5-dihydro-3-methyl-4-[2-[4-[[(4-methylphenyl)sulfonyl]oxy]phenyl]diazenyl]-5-oxo-1H-pyrazol-1-yl]-,sodium salt (1:1); Benzyl Fast Yellow GR; Fenafor Yellow 2G; C.I. Acid Yellow 40, monosodium salt (8CI); Milling FastYellow PG;Pollen Yellow Red; C.I. Acid Yellow 40; Sulfonine Yellow 2G; C.I. Acid Yellow 40, sodium salt; Milling Yellow 2GN; Telon Light YellowFKG; Acid LeatherYellow G; Acid Yellow 40; NSC 47729; Milling Yellow 5G; Polar Yellow;Benzyl Fast Yellow GNC; Sandofast Yellow N; Belacid Milling Yellow 2G; Bucacid Yellow 3G;Peeracid Milling Yellow 2G;
CAS Registry Number:6372-96-9
EINECS: 228-907-9
Molecular Weight: 584.9844
InChI: InChI=1/C23H19ClN4O7S2.Na/c1-14-3-10-19(11-4-14)37(33,34)35-18-8-6-17(7-9-18)25-26-22-15(2)27-28(23(22)29)20-12-5-16(24)13-21(20)36(30,31)32;/h3-13,29H,1-2H3,(H,30,31,32);/q;+1/p-1/b26-25+;
Molecular Formula: C23H19 Cl N4 O7 S2 . Na
Molecular Structure:

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References of Benzenesulfonic acid,5-chloro-2-[4,5-dihydro-3-methyl-4-[2-[4-[[(4-methylphenyl)sulfonyl]oxy]phenyl]diazenyl]-5-oxo-1H-pyrazol-1-yl]-,sodium salt (1:1)

Title: Polar? Yellow (Ciba)
CAS Registry Number: 6372-96-9
CAS Name: 5-Chloro-2-[4,5-dihydro-3-methyl-4-[[4-[[(4-methylphenyl)sulfonyl]oxy]phenyl]azo]-5-oxo-1H-pyrazol-1-yl]benzenesulfonic acid monosodium salt
Synonyms: 4-p-hydroxybenzeneazo-1-p-chloro-o-sulfophenyl-3-methyl-5-hydroxypyrazole toluene-p-sulfonyl ester sodium salt; C.I. Acid Yellow 40; C.I. 18950
Molecular Formula: C23H18ClN4NaO7S2
Molecular Weight: 584.98
Percent Composition: C 47.22%, H 3.10%, Cl 6.06%, N 9.58%, Na 3.93%, O 19.15%, S 10.96%
Literature References: Prepn from diazotized p-aminophenol and 1-(o-sulfo-p-chlorophenyl)-3-methyl-5-pyrazolone: B. Richard, US 1067881 (Geigy). See also: Colour Index vol. 4 (3rd ed., 1971) p 4128.
Properties: Yellowish-brown powder. Sol in water giving a pure yellow soln; in alcohol (yellow color); in alkalies; in concd sulfuric acid. Slightly sol in ethanol, acetone. Insol in other org solvents. Precipitated by dil acids.
Use: To dye wool. In the isoln of polymyxin.