CAS 2610-11-9: Direct Red 81

Description:Direct Red 81, with the CAS number 2610-11-9, is a synthetic azo dye commonly used in various applications, including textiles, paper, and food coloring. It is characterized by its vibrant red hue, which is attributed to the presence of azo groups (-N=N-) in its molecular structure. This dye is water-soluble, allowing it to be easily applied in aqueous solutions, and it exhibits good lightfastness and washfastness, making it suitable for use in products that require durability. Direct Red 81 is known for its ability to impart bright colors and is often utilized in the dyeing of cotton and other natural fibers. However, like many azo dyes, it has raised environmental and health concerns due to potential toxicity and the risk of releasing aromatic amines upon degradation. As a result, its use is regulated in certain applications, particularly in food and cosmetics. Overall, Direct Red 81 is a significant compound in the dye industry, valued for its color properties while also necessitating careful handling and regulation.

Formula:C₂₉H₂₁N₅O₈S₂·2Na

InChI:InChI=1S/C29H21N5O8S2.2Na/c35-28-25-15-12-23(30-29(36)18-4-2-1-3-5-18)16-19(25)17-26(44(40,41)42)27(28)34-33-21-8-6-20(7-9-21)31-32-22-10-13-24(14-11-22)43(37,38)39;;/h1-17,35H,(H,30,36)(H,37,38,39)(H,40,41,42);;

InChI key:InChIKey=UGAKDASQLXZVMN-UHFFFAOYSA-N

SMILES:[Na].O=C(NC=1C=CC=2C(C1)=CC(=C(N=NC3=CC=C(N=NC4=CC=C(C=C4)S(=O)(=O)O)C=C3)C2O)S(=O)(=O)O)C=5C=CC=CC5

Synonyms:
2-Naphthalenesulfonic acid, 7-(benzoylamino)-4-hydroxy-3-[2-[4-[2-(4-sulfophenyl)diazenyl]phenyl]diazenyl]-, sodium salt (1:2)
2-Naphthalenesulfonic acid, 7-(benzoylamino)-4-hydroxy-3-[[4-[(4-sulfophenyl)azo]phenyl]azo]-, disodium salt
Airedale Red KD
Aizen Primula Red 4BH
Amanil Fast Red 8BL
Amanil Fast Red 8BLW
Belamine Fast Red 8BL
Benzanil Fast Red K
Benzo Fast Red 8BL
Bordeaux EMBL
See more synonyms
Calcodur Red 8BL
Chloramine Fast Red 5BL
Chloramine Fast Red K
Chlorantine Fast Red
Chlorantine Fast Red 5B
Chloroantine fast red 5B
Chrome Leather Red 5B
Dialuminous Red 4B
Diaphtamine Light Red 4B
Diazine Fast Red 8BK
Diazo Light Red 8BD
Diazol Light Red 8B
Diphenyl Fast 5BL Supra I Red
Diphenyl Fast Red 5BL
Diphenyl Fast Red 5BLN
Diphenyl Red 5B
Direct Fast Red 2S
Direct Fast Red 5B
Direct Fast Red 8BL
Direct Light Red 4B
Direct Light Red 8B
Direct Light Red M 8BL
Direct Lightfast Red 2S
Direct Lightfast Red 4BS
Direct Red 5B
Durazol Red 2B
Durazol Red 2BP
Eliamina Red 8BL
Fabramine Red 8BL
Fastolite Red 8BL
Fastusol Red 4BA-CF
Fenaluz Red 4B
Helion Red 8B
Hispaluz Red 8BL
Intralite Red 5B
Isma Fast Red 8B
Paranol Fast Red 8BL
Pergasol Red 2B
Pheno Fast Scarlet 9B
Pontamine Fast Red 8BLX
Pyrazol Fast Red 5BL
Pyrazol Fast Red 8BL
Pyrazoline Red 8BL
Saturn Red B
Sirius Red 4B
Sirius Red 4BA
Sirius Supra Red 4B
Solamine Red 4B
Solaminrot 4B
Solantine Red 8BL
Solar Red B
Solius Red 4B
Sumilight Red 4B
Suprazo Red 4B
Suprexcel Red 8BL
Tertrodirect Fast Red 5B
Tetramine Fast Red 8B
Triantine Fast Red 4BN
Triantine Light Red 4BN
disodium 4-hydroxy-7-[(phenylcarbonyl)amino]-3-[(E)-{4-[(E)-(4-sulfonatophenyl)diazenyl]phenyl}diazenyl]naphthalene-2-sulfonate
C.I. 28160
C.I. Direct Red 81 disodium salt
C.I. Direct Red 81 (VAN)
C.I. Direct Red 81 (7CI)
C.I. Direct Red 81
Direct Red 81
C.I. Direct Red 81, disodium salt

Found 4 products.

Product data	Purity	Price range	Estimated delivery
CHLORANTINE FAST RED 5B REF: IN-DA003OS5CAS: 2610-11-9	99%	29.00 €~598.00 €	Tue 15 Apr 25
Direct Red 81 REF: 7W-GT3983CAS: 2610-11-9	- - -	To inquire	Wed 16 Apr 25
Solaminrot 4B REF: TM-T20034CAS: 2610-11-9	98%	To inquire	Wed 16 Apr 25
Direct Red 81 REF: 3D-CAA61011CAS: 2610-11-9	- - -	143.00 €~464.00 €	Tue 27 May 25