Alizarine Blue

Title: Alizarine Blue
CAS Registry Number: 568-02-5
CAS Name: 5,6-Dihydroxynaphtho[2,3-f]quinoline-7,12-dione
Additional Names: 7,8-dihydroxy-5,6-phthalylquinoline; Alizarin Blue R; C.I. 67410
Molecular Formula: C17H9NO4
Molecular Weight: 291.26
Percent Composition: C 70.10%, H 3.11%, N 4.81%, O 21.97%
Literature References: Prepn from 3-nitroalizarin, glycerol, and concd sulfuric acid: Auerbach, J. Chem. Soc. 35, 799 (1879); Colour Index vol. 4 (3rd ed., 1971) p 4567.
Properties: Lustrous brownish violet needles from benzene, mp 268-270°. Practically insol in water; sparingly sol in alc, ether; slightly sol in cold benzene; sol in amyl alcohol, glacial acetic acid, hot benzene.
Melting point: mp 268-270°
Use: As indicator in saturated alcoholic soln. pH: pink 0.0 to yellow 1.6; yellow 6.0 to green 7.6.
Alizarine Orange Alizarine Yellow R Alkanet Alkannin Alkofanone