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Name	Acid Yellow 42	EINECS	228-940-9
CAS No.	6375-55-9	Density	1.617[at 20℃]
PSA	245.94000	LogP	6.07460
Solubility	soluble in water	Melting Point	N/A
Formula	C₃₂H₂₄N₈Na₂O₈S₂	Boiling Point	N/A
Molecular Weight	758.69	Flash Point	N/A
Transport Information	N/A	Appearance	bright yellow powder
Safety		Risk Codes	N/A
Molecular Structure		Hazard Symbols	N/A
Synonyms	C.I. AcidYellow 42, disodium salt (8CI);[1,1'-Biphenyl]-2,2'-disulfonic acid,4,4'-bis[(4,5-dihydro-3-methyl-5-oxo-1-phenyl-1H-pyrazol-4-yl)azo]-, disodiumsalt (9CI);Acid Anthracene Yellow GR;Acid Fast Yellow MR;Acid Leather YellowCRS;Acid Milling Yellow M;Acid Milling Yellow R;Acid Yellow FG;Acid YellowK;Acid Yellow M;Acid Yellow MD;Acid Yellow MR;Acid yellow 42;AiredaleYellow 3GM;Alphanol Fast Brilliant Yellow F 333;Amacid Fast Yellow RS;AmacidFast Yellow RS-EX;Ambinyl Yellow MR;Anadurm Yellow M-G;Apollo Nylon FastYellow M-R;Belacid Milling Yellow R;Benzyl Fast Yellow RS;Best Acid MillingYellow GR;C.I. 22910;C.I. Acid Yellow 42;Calcocid Milling Yellow R;Colorosacid Yellow R;Concorde Acid Yellow M-GR;Concorde Leather Yellow MR;Coomassie Yellow R;Coomassie Yellow RP;Coomassie Yellow RS;Coriacide Yellow3J;Covalene Yellow MR;Covanyl Yellow MR;Cyanine Fast Yellow M;DermacidYellow 2R;Dinacid Milling Yellow M;Dycosacid Leather Yellow MR;DynacidYellow RS;Eniacid Fast Yellow R;Erio Fast Yellow RL;Everacid Milling YellowMR;Everacid Yellow MR;Fast Silk Yellow SH;Follone Yellow R;Formo AcidYellow 42;Indacid Yellow A;KCA Acid Milling Yellow M;KemacidYellow GRX;Kenanthrol Yellow R;Lecotan Yellow SH;Midlon Yellow 2R;MidlonYellow PR;Milling Fast Yellow R;Milling Yellow 3G;Milling Yellow 3J;MillingYellow FG;Milling Yellow RX;Multicuer Yellow BR;Naphthalene Leather Yellow2G;Naphthazine Yellow MR;Optanol Yellow R;Orient Water Yellow 6;OrientWater Yellow 6C;Pharmacine Yellow R;Pharmatex Yellow G;Ratna Acid Yellow R;Sakolan Yellow KN;Sandolan Milling Yellow N-SH;Shikiso Acid Fast Yellow MR;Simacid Yellow 25145;Sulfonine Yellow CSR;Sulphon Yellow RS-CF;SuminolMilling Yellow MR;Supranol Yellow R;Symulon Acid Fast Yellow MR;TertracidMilling Yellow R;Triacid Fast Milling Yellow 2R;Triacid Yellow 2R;VicoacidYellow 42;Vopsider Yellow ARL;Water Yellow 6;Water Yellow 6C;Xylene MillingYellow SH;

Acid Yellow 42 Consensus Reports

Reported in EPA TSCA Inventory.

Acid Yellow 42 Specification

The IUPAC name of C.I. Acid Yellow 42 disodium salt is disodium 5-[(3-methyl-5-oxo-1-phenyl-4H-pyrazol-4-yl)diazenyl]-2-[4-[(3-methyl-5-oxo-1-phenyl-4H-pyrazol-4-yl)diazenyl]-2-sulfonatophenyl] benzenesulfonate. With the CAS registry number 6375-55-9, it is also named as Acid Yellow 42. The product's categories are Dyes and Pigments; Organics, and the other registry numbers are 253167-34-9; 63993-46-4; 74968-16-4; 846606-98-2 and 84843-16-3. Besides, it is bright yellow powder, which is soluble in water. In addition, its molecular formula is C₃₂H₂₄N₈Na₂O₈S₂ and molecular weight is 758.69.

The other characteristics of this product can be summarized as: (1)H-Bond Donor: 0; (2)H-Bond Acceptor: 14; (3)Rotatable Bond Count: 7; (4)Tautomer Count: 10; (5)Exact Mass: 758.095391; (6)MonoIsotopic Mass: 758.095391; (7)Topological Polar Surface Area: 246; (8)Heavy Atom Count: 52; (9)Complexity: 1480; (10)EINECS: 228-940-9.

Preparation and Uses of C.I. Acid Yellow 42 disodium salt: please dizotize Benzidine 2,2'-disulfonic acid. And then put the resultant to couple with 1-Phenyl-3-methyl-5-pyrazolone. You will obtain this chemical after salting out, filtration, drying and crushing. Moreover, this product is used for dyeing of leather, nylon and wool. It also can be used for direct printing of wool, silk and viscose fabric.

People can use the following data to convert to the molecule structure.
(1)SMILES: [Na+].[Na+].O=C5N(/N=C(/C)C5/N=N/c1ccc(c(c1)S([O-])(=O)=O)c4ccc(/N=N/C3\C(=N/N(c2ccccc2)C3=O)C)cc4S([O-])(=O)=O)c6ccccc6
(2)InChI: InChI=1/C32H26N8O8S2.2Na/c1-19-29(31(41)39(37-19)23-9-5-3-6-10-23)35-33-21-13-15-25(27(17-21)49(43,44)45)26-16-14-22(18-28(26)50(46,47)48)34-36-30-20(2)38-40(32(30)42)24-11-7-4-8-12-24;;/h3-18,29-30H,1-2H3,(H,43,44,45)(H,46,47,48);;/q;2*+1/p-2/b35-33+,36-34+
(3)InChIKey: ZRYQXQUPWQNYSX-IGCXZFQTBO
(4)Std. InChI: InChI=1S/C32H26N8O8S2.2Na/c1-19-29(31(41)39(37-19)23-9-5-3-6-10-23)35-33-21-13-15-25(27(17-21)49(43,44)45)26-16-14-22(18-28(26)50(46,47)48)34-36-30-20(2)38-40(32(30)42)24-11-7-4-8-12-24;;/h3-18,29-30H,1-2H3,(H,43,44,45)(H,46,47,48);;/q;2*+1/p-2/b35-33+,36-34+
(5)Std. InChIKey: ZRYQXQUPWQNYSX-UUIOKUIJSA-L

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