Aromatic Azo- and Benzidine-Based Substances

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Azo Solvent Dyes

Monoazo Solvent Dyes
Substances Colour Index (C.I.) Information [1] Empirical Data Availability [***] Section 71
Chemical Abstracts Service Registry Number (CAS RN) Domestic Substances List (DSL) Name C.I. Generic Name(s) C.I. Consti-
tution Number(s)
Other CASNo. Asso-
ciated with C.I. name / number
Physical-Chemical Properties Ecolo-
gical End-
points
Health End-
points
Water Solu-
bility
Log Kow Mel-
ting / Decom-
posi-
tion point
60-09-3 Benzenamine, 4-(phenylazo)- C.I.Solvent Yellow 1 C.I.11000   -- X -- X -- X N
60-11-7 Benzenamine, N,N-dimethyl-4-(phenylazo)- C.I.Solvent Yellow 2 C.I.11020  -- X X X X X N
97-56-3 Benzenamine, 2-methyl-4-[(2-methylphenyl)azo]- C.I.Solvent Yellow 3  C.I.11160  -- X -- X -- X N
101-75-7 Benzenamine, N-phenyl-4-(phenylazo)- -- -- -- -- -- X -- X N
103-33-3 Diazene, diphenyl- -- -- -- X -- X -- X Y
495-54-5 1,3-Benzenediamine, 4-(phenylazo)- C.I.Solvent Orange 3 C.I.11270:1  -- X -- X X X N
842-07-9 2-Naphthalenol, 1-(phenylazo)- C.I.Disperse Yellow 97 , C.I.Solvent Yellow 14 C.I.12055  -- X X X X X Y
1229-55-6 2-Naphthalenol, 1-[(2-methoxyphenyl)azo]- C.I.Solvent Red 1 C.I.12150  -- X X X X X N
2646-17-5 2-Naphthalenol, 1-[(2-methylphenyl)azo]- C.I.Solvent Orange 2 C.I.12100  -- X X X X X N
2653-64-7 2-Naphthalenol, 1-(1-naphthalenylazo)- C.I.Pigment Red 40, C.I.Solvent Red 4 C.I.12170  -- X -- X X -- Y
2832-40-8 Acetamide, N-[4-[(2-hydroxy-5-methylphenyl)azo]phenyl]- C.I.Disperse Yellow 3, C.I.Solvent Yellow 77 C.I.11855  -- X X X X X N
3118-97-6 2-Naphthalenol, 1-[(2,4-dimethylphenyl)azo]- C.I.Solvent Orange 7 C.I.12140  -- -- X -- X X N
5290-62-0 1-Naphthalenol, 4-[(4-nitrophenyl)azo]- -- -- -- X X X X X N
6407-78-9 3H-Pyrazol-3-one, 4-[(2,4-dimethylphenyl)azo]-2,4-dihydro-5-methyl-2-phenyl- C.I.Solvent Yellow 18 C.I.12740  -- -- -- X -- X Y
6535-42-8 1-Naphthalenol, 4-[(4-ethoxyphenyl)azo]- C.I.Solvent Red 3 C.I.12010  -- -- -- -- -- -- N
Disazo Solvent Dyes
Substances Colour Index (C.I.) Information [1] Empirical Data Availability [***] Section 71
Chemical Abstracts Service Registry Number (CAS RN) Domestic Substances List (DSL) Name C.I. Generic Name(s) C.I. Consti-
tution Number(s)
Other CASNo. Asso-
ciated with C.I. name / number
Physical-Chemical Properties Ecolo-
gical End-
points
Health End-
points
Water Solu-
bility
Log Kow Mel-
ting / Decom-
posi-
tion point
85-83-6 2-Naphthalenol, 1-[[2-methyl-4-[(2-methylphenyl)azo]phenyl]azo]- C.I.Solvent Red 24 C.I.26105  -- X -- X X X Y
85-86-9 2-Naphthalenol, 1-[[4-(phenylazo)phenyl]azo]- C.I.Solvent Red 23 C.I.26100  -- X X X -- X N
6368-72-5 2-Naphthalenamine, N-ethyl-1-[[4-(phenylazo)phenyl]azo]- C.I.Solvent Red 19 C.I.26050  -- X -- X -- X N
21519-06-2 3H-Pyrazol-3-one, 2,4-dihydro-2-(3-hydroxyphenyl)-5-methyl-4-[[4-(phenylazo)phenyl]azo]- -- -- -- -- -- -- -- -- Y
73507-36-5 2-Naphthalenesulfonic acid, 7-(benzoylamino)-4-hydroxy-3-[[4-[(4-sulfophenyl)azo]phenyl]azo]-, compds. with N,N’-bis(mixed Ph and tolyl and xylyl)guanidine monohydrochloride C.I.Solvent Red 33 C.I.281601 -- -- -- -- -- -- N
73528-78-6 3-Pyridinecarbonitrile, 5-[[4-[(2,6-dichloro-4-nitrophenyl)azo]-2,5-dimethoxyphenyl]azo]-2,6-bis[(2-methoxyethyl)amino]-4-methyl- -- -- -- -- -- -- -- -- N
85392-21-8 3-Pyridinecarbonitrile, 5-[[2-chloro-4-(phenylazo)phenyl]azo]-2,6-bis[(3-methoxypropyl)amino]-4-methyl- -- -- -- -- -- -- -- -- Y

Notes and Legend

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2026-10-08