Reported in EPA TSCA Inventory.

The 2-Methyl-5-nitrobenzenesulfonic acid, with the CAS registry number 121-03-9, is also known as 2-Toluenesulfonic acid, 5-nitro. It belongs to the product category of Intermediates of Dyes and Pigments. Its EINECS registry number is 204-445-3. This chemical's molecular formula is C₇H₇NO₅S and molecular weight is 217.2. Its IUPAC name is called 2-methyl-5-nitrobenzenesulfonic acid. This chemical's classification code is Skin / Eye Irritant. 2-Methyl-5-nitrobenzenesulfonic acid is used as fluorescent brighteners and dyes intermediates.

Physical properties of 2-Methyl-5-nitrobenzenesulfonic acid are: (1)ACD/LogP: -0.313; (2)ACD/LogD (pH 5.5): -3.81; (3)ACD/LogD (pH 7.4): -3.81; (4)ACD/BCF (pH 5.5): 1.00; (5)ACD/BCF (pH 7.4): 1.00; (6)ACD/KOC (pH 5.5): 1.00; (7)ACD/KOC (pH 7.4): 1.00; (8)#H bond acceptors: 6; (9)#H bond donors: 1; (10)#Freely Rotating Bonds: 2; (11)Index of Refraction: 1.596 ; (12)Molar Refractivity: 47.759 cm³; (13)Molar Volume: 140.327 cm³; (14)Polarizability: 18.933 10-24cm³; (15)Surface Tension: 63.1689987182617 dyne/cm; (16)Density: 1.548 g/cm³;

Preparation of 2-Methyl-5-nitrobenzenesulfonic acid: this chemical can be prepared by 1-methyl-4-nitro-benzene. This reaction will need reagent oleum. The reaction time is 1 hour with reaction temperature of 75 °C. The yield is about 96%.

Uses of 2-Methyl-5-nitrobenzenesulfonic acid: it can be used to produce 4,4'-dinitro-bibenzyl-2,2'-disulfonic acid; disodium-compound at temperature of 65 °C. This reaction will need reagent NaOCl and solvent aq. NaOH with reaction time of 25 min. The yield is about 65%.

When you are using this chemical, please be cautious about it as the following:
This chemical may cause burns. There will be a risk of serious damage to eyes. In case of contact with eyes, you should rinse immediately with plenty of water and seek medical advice. Whenever you will contact it, please wear suitable protective clothing, gloves and eye/face protection.

You can still convert the following datas into molecular structure:
(1)Canonical SMILES: CC1=C(C=C(C=C1)[N+](=O)[O-])S(=O)(=O)O
(2)InChI: InChI=1S/C7H7NO5S/c1-5-2-3-6(8(9)10)4-7(5)14(11,12)13/h2-4H,1H3,(H,11,12,13)
(3)InChIKey: ZDTXQHVBLWYPHS-UHFFFAOYSA-N

The toxicity data is as follows: