Alizarine Yellow R

Title: Alizarine Yellow R
CAS Registry Number: 2243-76-7
CAS Name: 2-Hydroxy-5-[(4-nitrophenyl)azo]benzoic acid
Additional Names: 5-(p-nitrophenylazo)salicylic acid; p-nitrobenzeneazosalicylic acid; Alizarine Yellow RW; C.I. Mordant Orange 1; C.I. 14030
Molecular Formula: C13H9N3O5
Molecular Weight: 287.23
Percent Composition: C 54.36%, H 3.16%, N 14.63%, O 27.85%
Literature References: Prepd by coupling diazotized p-nitroaniline with salicylic acid: Armento, US 2746955 (1956 to General Aniline and Film); Colour Index vol. 4 (3rd ed., 1971) p 4058.
Properties: Orange-brown needles from dil glacial acetic acid, dec 253-254°. Sol in water, alc; slightly sol in acetone, Cellosolve; practically insol in other org solvents.
Derivative Type: Sodium salt
Additional Names: Mordant Yellow 3R
Molecular Formula: C13H8N3NaO5
Molecular Weight: 309.21
Percent Composition: C 50.50%, H 2.61%, N 13.59%, Na 7.44%, O 25.87%
Properties: Brownish yellow powder. Sol in water.
Use: Sodium salt used as indicator in 0.1% aq soln pH: yellow to red, range 10.2 to 12.0.
Alkanet Alkannin Alkofanone Allantoin Allenolic Acid

Alizarine Yellow R
Alizarin Yellow R (sodium salt)
Alizarin Yellow R (acid)
Identifiers
CAS number 1718-34-9 N,  (Na salt)
2243-76-7 (acid)[1]
ChemSpider 17215762 YesY
Jmol-3D images Image 1
Properties
Molecular formula C13H8N3NaO5 (Na salt)
C13H9N3O5 (acid)
Molar mass 309.21 g mol−1 (Na salt)
287.23 g mol−1 (acid)
Hazards
Main hazards Harmful
 N (verify) (what is: YesY/N?)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
Infobox references

Alizarine Yellow R is a yellow colored azo dye made by the diazo coupling reaction. It usually comes as a sodium salt. In its pure form it is a rust-colored solid.[2]