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Basic Information
CAS No.: 119-28-8
Name: 1-Naphthylamine-7-sulfonic acid
Article Data: 14
Molecular Structure:
Molecular Structure of 119-28-8 (1-Naphthylamine-7-sulfonic acid)
Formula: C10H9NO3S
Molecular Weight: 223.252
Synonyms: 1,7-Cleve'sacid;1-Amino-7-naphthalenesulfonic acid;1-Amino-7-sulfonaphthalene;8-Amino-2-naphthalenesulfonic acid;C.I.26135;Cleve's q-acid;NSC 4983;NSC 71784;8-Naphthylamine-2-sulfonic acid;2-naphthalenesulfonic acid, 8-amino-;8-aminonaphthalene-2-sulfonic acid;
EINECS: 204-311-4
Density: 1.502 g/cm3
Melting Point: ≥300 °C(lit.)
Boiling Point: 220°C (rough estimate)
Hazard Symbols: CorrosiveC
Risk Codes: 34
Safety: 26-36/37/39-45
Transport Information: UN 2585 8/PG 3
PSA: 88.77000
LogP: 3.33070
Synthetic route
120-18-3

naphthalene-2-sulfonate

A

119-79-9

5-aminonaphthalene-2-sulfonic acid

B

119-28-8

8-amino-2-naphthalenesulfonic acid

Conditions
ConditionsYield
With sulfuric acid; nitric acid at 25℃; anschl. bei 10grad, Reduzieren des erhaltenen Gemisches mit Eisen und sehr verd. Salzsaeure;
With sulfuric acid; nitric acid at 25℃; dann bei 10grad, Reduzieren des erhaltenen Gemisches mit Eisen und sehr verd. Salzsaeure;
Stage #1: naphthalene-2-sulfonate With sulfuric acid at 120℃; for 0.666667h;
Stage #2: With nitric acid at 33 - 35℃; for 20h; Reagent/catalyst; Overall yield = 86 percent; Overall yield = 75 g; Further stages;
18425-74-6

1-nitro-7-naphthalenesulfonic acid

119-28-8

8-amino-2-naphthalenesulfonic acid

Conditions
ConditionsYield
With ammonium sulfide
With iron; acetic acid
20191-62-2

8-hydroxy-naphthalene-2-sulfonic acid

sodium disulfite

sodium disulfite

119-28-8

8-amino-2-naphthalenesulfonic acid

Conditions
ConditionsYield
Reaktion des Natriumsalzes; Erhitzen des Reaktionsprodukts mit Ammoniak unter Druck auf 100-110grad, dann beim Ansaeuern;
7664-93-9

sulfuric acid

486-54-4

1-amino-naphthalene-2,7-disulfonic acid

119-28-8

8-amino-2-naphthalenesulfonic acid

486-54-4

1-amino-naphthalene-2,7-disulfonic acid

119-28-8

8-amino-2-naphthalenesulfonic acid

Conditions
ConditionsYield
unter Druck;
18425-74-6

1-nitro-7-naphthalenesulfonic acid

ammonium sulfide

ammonium sulfide

119-28-8

8-amino-2-naphthalenesulfonic acid

119-28-8

8-amino-2-naphthalenesulfonic acid

20191-62-2

8-hydroxy-naphthalene-2-sulfonic acid

Conditions
ConditionsYield
Stage #1: 8-amino-2-naphthalenesulfonic acid With water; sodium hydrogensulfite for 15h; Reflux; Inert atmosphere;
Stage #2: With sodium hydroxide In water for 4h; Reflux;
Stage #3: With hydrogenchloride In water
95%
With sodium disulfite man kocht und macht alkalisch;
With sodium hydroxide at 260℃;
119-28-8

8-amino-2-naphthalenesulfonic acid

3024-72-4

3,4-dichlorobenzoyl chloride

1415094-32-4

8-(3,4-dichlorobenzamido)naphthalene-2-sulfonic acid

Conditions
ConditionsYield
With pyridine at 20℃; for 12h; Inert atmosphere;91%
119-28-8

8-amino-2-naphthalenesulfonic acid

100-01-6

4-nitro-aniline

8-amino-5-(4-nitro-phenylazo)-2-naphthalenesulfonic acid

Conditions
ConditionsYield
Stage #1: 4-nitro-aniline With hydrogenchloride; sodium nitrite In water at 0℃; for 0.333333h;
Stage #2: 8-amino-2-naphthalenesulfonic acid In methanol; water at 20℃; for 0.5h;
90%
119-28-8

8-amino-2-naphthalenesulfonic acid

8-amino-5,8'-azo-bis-naphthalene-2-sulphonic acid

Conditions
ConditionsYield
With hydrogenchloride; sodium nitrite at 55℃; for 0.5h; pH=2;87%
With ethanol; nitrate radical
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Specification

The 1-Naphthylamine-7-sulfonic acid, with the CAS registry number 119-28-8 and EINECS registry number 204-311-4, has the systematic name and IUPAC name of 8-aminonaphthalene-2-sulfonic acid. It belongs to the following product categories: Intermediates of Dyes and Pigments; Intermediates. And the molecular formula of this chemical is C10H9NO3S.

The physical properties of 1-Naphthylamine-7-sulfonic acid are as following: (1)ACD/LogP: 0.42; (2)# of Rule of 5 Violations: 0; (3)ACD/LogD (pH 5.5): -3.04; (4)ACD/LogD (pH 7.4): -3.08; (5)ACD/BCF (pH 5.5): 1; (6)ACD/BCF (pH 7.4): 1; (7)ACD/KOC (pH 5.5): 1; (8)ACD/KOC (pH 7.4): 1; (9)#H bond acceptors: 4; (10)#H bond donors: 3; (11)#Freely Rotating Bonds: 2; (12)Polar Surface Area: 54.99 Å2; (13)Index of Refraction: 1.713; (14)Molar Refractivity: 58.27 cm3; (15)Molar Volume: 148.6 cm3; (16)Polarizability: 23.1×10-24cm3; (17)Surface Tension: 72.1 dyne/cm; (18)Density: 1.502 g/cm3.

Preparation and uses of 1-Naphthylamine-7-sulfonic acid: It can be prepared by naphthalin via sulfonation, nitration, neutralization, reduction and acid out. What's more, it is an intermediates of dyes and pigments, and it is also used in determination of nitrite formation from nitrate by bacteria.

You should be cautious while dealing with this chemical. It may cause burns. Therefore, you had better take the following instructions: Wear suitable protective clothing, gloves and eye/face protection, and in case of contacting with eyes, rinse immediately with plenty of water and seek medical advice; In case of accident or if you feel unwell, seek medical advice immediately (show label where possible).

You can still convert the following datas into molecular structure:
(1)SMILES: O=S(=O)(O)c1cc2c(cc1)cccc2N
(2)InChI: InChI=1/C10H9NO3S/c11-10-3-1-2-7-4-5-8(6-9(7)10)15(12,13)14/h1-6H,11H2,(H,12,13,14)
(3)InChIKey: QEZZCWMQXHXAFG-UHFFFAOYAH