Chemistry:Acid Orange 7

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
PubChem CID	23682006
UNII	Q1LIY3BO0U Y
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).
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Infobox references

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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.

HO
3SC
6H
4N+
2 + C
10H
7OH → HO
3SC
6H
4N=NC
10H
6OH + H+