2-Mercapto-5-methylbenzoic acid CAS 24155-85-9
| CAS No. | 24155-85-9 |
| Molecular Formula | C8H8O2S |
| Molecular Weight | 168.21 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
2-Mercapto-5-methylbenzoic acid (CAS 24155-85-9), molecular formula C8H8O2S and molecular weight 168.21 g/mol, is a CATO reference standard with documented purity and traceability.
Owing to a sulfone group, a carboxylic acid group, a hydroxyl group, an ether linkage, an aromatic ring system, 2-Mercapto-5-methylbenzoic acid is typically off-white to pale yellow crystalline powder. Its solid-state physicochemical attributes — including a molecular weight of 168.21 g/mol — guide the selection of appropriate sample preparation and analytical techniques. The aromatic system may exhibit native fluorescence, enabling detection with a fluorescence detector (FLD).
Recommended for analytical method development and validation; each product is supplied with a full Certificate of Analysis (COA) ensuring ISO 17034 metrological traceability.
As a certified reference material (CRM), 2-Mercapto-5-methylbenzoic acid meets the metrological traceability requirements of ISO/IEC 17025 laboratories. Batch-to-batch consistency is monitored via control charts to guarantee comparable assigned values across lots.
Physical & Chemical Properties
| Molecular Formula | C8H8O2S |
| Molecular Weight | 168.21 g/mol |
| Purity | 97%+ |
| Storage | Store at 2-8°C |
| Solubility (reference) | Soluble in methanol, acetonitrile, DMSO, water (slightly soluble) |
| Stability | May oxidize slowly on prolonged air exposure |
| Degree of Unsaturation (DBE) | 5.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1963 |
| Sulfur Atoms | 1 |
Related Mercapto Standards
- 3-Mercapto-2,3-dihydrobenzofuran-6-ol (CAS 1039963-37-5)
- 2-Mercapto-4-methylbenzoic acid (CAS 17839-52-0)
- 2-Mercapto-6-methylbenzoic acid (CAS 17839-53-1)
- 3-Mercapto-2-methylbenzoic acid (CAS 188700-62-1)
- 2-Mercapto-4-methoxybenzaldehyde (CAS 294674-98-9)
- 3-Mercapto-4-methylbenzoic acid (CAS 200720-35-0)
- 4-Mercapto-3-methoxybenzaldehyde (CAS 96495-18-0)
- 4-Mercapto-3-methylbenzoic acid (CAS 948833-50-9)
Recommended Standards
- 2-Methyl-5-sulfanylbenzoic acid (CAS 84889-58-7)
- 2-Hydroxy-5-(methylthio)benzaldehyde (CAS 67868-84-2)
- 2-phenyl-2-sulfanylacetic acid (CAS 4695-09-4)
- 2-Ethoxyethyl methanesulfonate (CAS 98139-68-5)
- 2-(1H-Imidazol-2-yl)propan-1-amine dihydrochloride (CAS 92932-35-9)
- Tert-butyl 3,3,3-trichloropropanimidate (CAS 351004-29-0)
- 6-Bromo-2-(difluoromethyl)-5-(trifluoromethyl)nicotinic acid (CAS 1805255-16-6)
- 1,3-Dibromo-2-(methoxymethoxy)-benzene (CAS 142273-81-2)
- Benzyl 5-azaspiro[2.5]octane-5-carboxylate (CAS 1454650-21-5)
- 1,2-Dibromo-4,5-bis(trifluoromethyl)benzene (CAS 64219-36-9)
- Methyl 3-amino-6-chloro-5-methoxypyrazine-2-carboxylate (CAS 2038-34-8)
- 1-Allyl-1H-indole-2,3(3aH,7aH)-dione (CAS 374598-03-5)
- (5-chloro-6-methyl-1,3-benzoxazol-2-yl)methylamine hydrochloride (CAS 1035840-75-5)
- Tirzepatide Impurity 34 (CAS CATO-C4X-324034)
Why CATO?
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