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 ;
3D model (JSmol)	Interactive image ;
ChemSpider	21171709 ;
ECHA InfoCard	100.010.182
PubChem CID	23682006 ;
UNII	Q1LIY3BO0U ;
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 Key: CQPFMGBJSMSXLP-UHFFFAOYSA-M ; 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
Density	1.525 g/cm3
Melting point	164 °C
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Last updated June 08, 2025

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]

References

↑ Klaus Hunger; Peter Mischke; Wolfgang Rieper; Roderich Raue; Klaus Kunde; Aloys Engel (2005). "Azo Dyes". Ullmann's Encyclopedia of Industrial Chemistry . Weinheim: Wiley-VCH. doi:10.1002/14356007.a03_245. ISBN 978-3-527-30673-2..
↑ www.chemicalland21.com

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[Ullmann-1] Klaus Hunger; Peter Mischke; Wolfgang Rieper; Roderich Raue; Klaus Kunde; Aloys Engel (2005). "Azo Dyes". Ullmann's Encyclopedia of Industrial Chemistry . Weinheim: Wiley-VCH. doi:10.1002/14356007.a03_245. ISBN 978-3-527-30673-2..

[2] www.chemicalland21.com

[1]

[2]

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
Density	1.525 g/cm³
Melting point	164 °C
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