Methyl yellow

Methyl yellow

Names
Preferred IUPAC name N,N-Dimethyl-4-(phenyldiazenyl)aniline
Other names 4-Dimethylaminoazobenzene p-Dimethylaminoazobenzene DAB N,N-Dimethyl-4-phenylazoaniline N,N-Dimethyl-4-aminoazobenzene Butter Yellow Solvent Yellow 2 C.I. 11020
Identifiers
CAS Number	60-11-7 Y
3D model (Jmol)	Interactive image
ChEMBL	ChEMBL263116 Y
ChemSpider	5829 Y
ECHA InfoCard	100.000.414
EC Number	200-455-7
PubChem	6053
RTECS number	BX7350000
UNII	A49L8E13FD Y
InChI InChI=1S/C14H15N3/c1-17(2)14-10-8-13(9-11-14)16-15-12-6-4-3-5-7-12/h3-11H,1-2H3/b16-15+ Y Key: JCYPECIVGRXBMO-FOCLMDBBSA-N Y InChI=1/C14H15N3/c1-17(2)14-10-8-13(9-11-14)16-15-12-6-4-3-5-7-12/h3-11H,1-2H3/b16-15+ Key: JCYPECIVGRXBMO-FOCLMDBBBF
SMILES N(=N/c1ccccc1)\c2ccc(N(C)C)cc2
Properties
Chemical formula	C14H15N3
Molar mass	225.30 g·mol−1
Appearance	Yellow crystals
Melting point	111–116 °C (232–241 °F; 384–389 K) decomposes
Solubility in water	13.6 mg/l
log P	4.58
Hazards
Main hazards	Carcinogen
GHS pictograms
GHS signal word	Danger
GHS hazard statements	H301, H351
GHS precautionary statements	P281, P301+310
EU classification (DSD)	T
R-phrases	R25, R40
S-phrases	S36/37, S45
NFPA 704	1 2 0
US health exposure limits (NIOSH):
PEL (Permissible)	OSHA-regulated carcinogen
REL (Recommended)	Ca
IDLH (Immediate danger)	Ca [N.D.]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Y  (what is YN ?)
Infobox references

Methyl yellow, or C.I. 11020, is a chemical compound which may be used as a pH indicator.

In aqueous solution at low pH, methyl yellow appears red. Between pH 2.9 and 4.0, methyl yellow undergoes a transition, to become yellow above pH 4.0.

It is a possible carcinogen. As "butter yellow", the agent had been used as a food additive before its toxicity was recognized. The result from consuming such chemicals is tumors on the liver.

Structurally similar compounds: