Molecule structure of Direct red 23 (CAS NO.3441-14-3) :

IUPAC Name: disodium 4-oxo-3-[[4-(2-oxoethylamino)phenyl]hydrazinylidene]-6-[[(6E)-5-oxo-6-
(phenylhydrazinylidene)-7-sulfonatonaphthalen-2-yl]carbamoylamino]naphthalene-2-sulfonate 
Molecular Weight: 813.72344 g/mol
Molecular Formula: C₃₅H₂₅N₇Na₂O₁₀S₂
Appreance: purple-red powder
H-Bond Donor: 5
H-Bond Acceptor: 15
Rotatable Bond Count: 9
Tautomer Count: 585
Exact Mass: 813.089971
MonoIsotopic Mass: 813.089971
Topological Polar Surface Area: 268
Heavy Atom Count: 56 
Complexity: 1780
Canonical SMILES: C1=CC=C(C=C1)NN=C2C(=CC3=C(C2=O)C=CC(=C3)NC(=O)NC4=CC5=C(C=C4)C=C(C(=
NNC6=CC=C(C=C6)NCC=O)C5=O)S(=O)(=O)[O-])S(=O)(=O)[O-].[Na+].[Na+]
Isomeric SMILES: C1=CC=C(C=C1)N/N=C\2/C(=CC3=C(C2=O)C=CC(=C3)NC(=O)NC4=CC5=C(C=C4)C=C(C(=NNC6=CC=C(C=C6)NCC=O)C5=O)S(=O)(=O)[O-])S(=O)(=O)[O-].[Na+].[Na+]
InChIKey: NTZBPMQAAGEDKS-HLBGQXDOSA-L
EINECS: 222-348-4
Product Categories: Dyes and Pigments; Organics; D; Stains and Dyes; Stains&Dyes, A to

 Direct red 23 (CAS NO.3441-14-3) can be used for cotton, viscose fabric dyeing and printing, but are used for viscose fabrics more and cotton fabrics using less, to yellow red. Dyeing rate is good, poor dye transfer, for salt-sensitive. Stained by the dye-fixing agent Y treatment, the wet fastness is not satisfactory. Red dye can be used alone, Qian Hong, may also be used to fight dyed yellow, orange, red, brown and other colors. Can be used for dyeing silk, wool, linen and other fabrics and silk fabric printing. For cotton, viscose blended fabric dyeing, silk, wool color yield lighter, nylon severe staining, 2 cellulose acetate, polyester micro-staining.

 Aniline and p-amino acetophenone by diazotization, the acid were coupled with the scarlet and then by ammonium sulfate precipitation, filtration and drying derived. Consumption of raw materials (kg/t) aniline 55 scarlet acid (100%) 330 pairs of amino acetanilide (100%) 95 hydrochloric acid (31%) 380 Sodium nitrite (100%) 110 soda ash (industrial) 170 salt 210 Sodium hydroxide ( 100%) 85.

WGK Germany: 2
RTECS: QK1237500

 Direct red 23 (CAS NO.3441-14-3) is also called Airedale Scarlet 4BD ; Aizen Primula Scarlet 4BSH ; Benzanil Fast ; Scarlet 4BSN ; Benzo Fast Scarlet 4BS (6CI) ; C.I. Direct Red 23 (VAN) ; C.I. Direct Red 23, disodium salt ; Chlorazol Fast Scarlet 4BSP ; Chrome Leather Scarlet SE ; Columbia Fast Scarlet 4BS ; Diazamine Fast Scarlet 4BS ; Diphenyl Scarlet RS ; Direct Brilliant Red 4A ; Direct Fast Scarlet 4B ; Direct Scarlet Lightfast ; Direct Scarlet SE ; Phenamine Fast Scarlet 4BS ; Wogenal Scarlet CB ;2-Naphthalenesulfonic acid, 3-((4-(acetylamino)phenyl)azo)-4-hydroxy-
7-((((5-hydroxy-6-(phenylazo)-7-sulfo-2- naphthalenyl)amino)carbonyl)amino)-, disodium salt ; 2-Naphthalenesulfonic acid, 3-(2-(4-(acetylamino)phenyl)diazenyl)-4- hydroxy-7-((((5-hydroxy-6-(2-phenyldiazenyl)-7-sulfo-2-naphthalenyl)amino)carbonyl)amino)-, sodium salt (1:2) . Water-soluble of Direct red 23 (CAS NO.3441-14-3) is medium and water solution was bright red. Its solution add dilute sulfuric acid slowed the blue, add concentrated hydrochloric acid produces a red wine sediment, plus concentrated alkali turn red orange brown. Slightly soluble in ethanol, orange, and do not dissolve in acetone. In concentrated sulfuric acid was in the red to magenta, orange, diluted turn brown; in concentrated nitric acid has orange-yellow precipitate produced; do not dissolve in concentrated alkali; soluble in concentrated ammonia was bright red. Copper ions when relying stained darker shade, shade no change in case of iron.