Acid Orange 7

Names
IUPAC name sodium 4-[(2E)-2-(2-oxonaphthalen-1-ylidene)hydrazinyl]benzenesulfonate
Other names 2-naphthol orange, Orange II, CI 15510, D&C Orange 4, COLIPA C015
Identifiers
CAS Number	633-96-5 Y
3D model (JSmol)	Interactive image
ChemSpider	21171709 Y
ECHA InfoCard	100.010.182
PubChem CID	23682006
UNII	Q1LIY3BO0U Y
CompTox Dashboard (EPA)	DTXSID0038881
InChI InChI=1S/C16H12N2O4S.Na/c19-15-10-5-11-3-1-2-4-14(11)16(15)18-17-12-6-8-13(9-7-12)23(20,21)22;/h1-10,19H,(H,20,21,22);/q;+1/p-1 Y Key: CQPFMGBJSMSXLP-UHFFFAOYSA-M Y InChI=1/C16H12N2O4S.Na/c19-15-10-5-11-3-1-2-4-14(11)16(15)18-17-12-6-8-13(9-7-12)23(20,21)22;/h1-10,19H,(H,20,21,22);/q;+1/p-1 Key: CQPFMGBJSMSXLP-REWHXWOFAS
SMILES [Na+].[O-]S(=O)(=O)c1ccc(cc1)N=Nc2c3ccccc3ccc2O
Properties
Chemical formula	C16H11N2NaO4S (sodium salt)
Molar mass	350.32 g/mol
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Y verify (what is YN ?) Infobox references

Acid Orange 7, also known as 2-naphthol orange is an azo dye. It is used for dyeing wool.

Preparation

It is produced by azo coupling of β-naphthol and diazonium derivative of sulfanilic acid.^[1][2]

HO₃SC₆H₄N+2 + C₁₀H₇OH → HO₃SC₆H₄N=NC₁₀H₆OH + H⁺