CAS No 493-52-7 , 2-[[4-(dimethylamino)phenyl]diazenyl]benzoic acid Search by region : Germany

Name: 2-[[4-(dimethylamino)phenyl]diazenyl]benzoic acid
Synonyms: 493-52-7; 4-Dimethylamino-2'-carboxylazobenzene;2-[[4-(dimethylamino)phenyl]diazenyl]benzoic acid; Acid Red 2;O-METHYL RED; C.I. Acid Red 2; 2-Carboxy-4'-(dimethylamino)azobenzene;
CAS Registry Number:493-52-7
Transport: UN 1170
Melting Point: 178-182 ºC
Boiling Point: 479.5°Cat760mmHg
Density: 0.839 g/mL at 25 °C
Refractive index: 1.592
Safety Statements: R10;R20/21/22;R68
Hazard Symbols: Xn: Harmful;
HS Code: 29270000
EINECS: 207-776-1
Molecular Weight: 269.2985
InchiKey: CEQFOVLGLXCDCX-UHFFFAOYSA-N
InChI: InChI=1S/C15H15N3O2/c1-18(2)12-9-7-11(8-10-12)16-17-14-6-4-3-5-13(14)15
(19)20/h3-10H,1-2H3,(H,19,20)
Risk Statements: S36/37
Molecular Formula: C₁₅H₁₅N₃O₂
Molecular Structure:

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References of 2-[[4-(dimethylamino)phenyl]diazenyl]benzoic acid

Title: Methyl Red
CAS Registry Number: 493-52-7
CAS Name: 2-[[4-(Dimethylamino)phenyl]azo]benzoic acid
Synonyms: C.I. Acid Red 2; C.I. 13020
Molecular Formula: C15H15N3O2
Molecular Weight: 269.30
Percent Composition: C 66.90%, H 5.61%, N 15.60%, O 11.88%
Literature References: Prepn by diazotization of anthranilic acid and coupling with dimethylaniline: Clarke, Kirner, Org. Synth. 2, 47 (1922). See also Colour Index vol. 4 (3rd ed., 1971) p 4043.
Properties: Glistening, violet crystals from toluene. mp 181-182°. pKa1 2.5; pKa2 9.5; pKb 4.8. Almost insol in water; sol in alcohol and in acetic acid.
Melting point: mp 181-182°
pKa: pKa1 2.5; pKa2 9.5; pKb 4.8
Use: As indicator in 0.1% alcoholic soln; pH: 4.4 red, 6.2 yellow. Used for titrating NH3, weak organic bases, e.g., alkaloids; not suitable for organic acids, except oxalic and picric acid. Methyl red is easily reduced, thereby losing its color, and readings should be made promptly. It is gradually being replaced by sulfonphthalein indicators, such as bromcresol green, which are more stable and exhibit a sharper change in color.