The 5-Amino-2-naphthalenesulfonic acid, with the CAS registry number 119-79-9 and EINECS registry number 257-269-4, has the systematic name of 5-aminonaphthalene-2-sulfonic acid. It is also known as 1,6-cleve's acid. And the molecular formula of this chemical is C₁₀H₉NO₃S. It belongs to the following product categories: Intermediates of Dyes and Pigments; Organics; Organic Building Blocks; Sulfonic/Sulfinic Acids; Sulfur Compounds.

The physical properties of 5-Amino-2-naphthalenesulfonic acid are as following: (1)ACD/LogP: 0.42; (2)# of Rule of 5 Violations: 0; (3)ACD/LogD (pH 5.5): -3.03 ; (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 5-Amino-2-naphthalenesulfonic acid(1,6-cleve's acid): It can start with the sulfonation of refined naphthalene, and gives 2-naphthalene sulfonic acid. The nitrification of 2-naphthalene sulfonic acid gives mixture of 1-nitro-6-naphthalene sulfonic acid and 1-nitro-7- naphthalene sulfonate. After the reduction of the mixture with magnesium salts, you can get magnesium aminonaphthol sulfonic acid. Seperate the mixture by taking advantage of difference solubility in a certain temperature. Then the desired 1,6-cleve's acid is obtained, and the other product is 1,7-cleve's acid. What's more, it is used in the preparation of azo dyes and sulfur dyes, such as direct fast blue BGL and sulfur blue CV.

You should be cautious while dealing with this chemical. It irritates eyes, respiratory system and skin. 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.

You can still convert the following datas into molecular structure:
(1)SMILES: O=S(=O)(O)c1ccc2c(c1)cccc2N
(2)InChI: InChI=1/C10H9NO3S/c11-10-3-1-2-7-6-8(15(12,13)14)4-5-9(7)10/h1-6H,11H2,(H,12,13,14)
(3)InChIKey: UWPJYQYRSWYIGZ-UHFFFAOYAF

The toxicity data is as follows: