1H-Thieno[2,3-d][1,2,3]triazole-5-carboxylic acid CAS 107166-05-2
| CAS No. | 107166-05-2 |
| Molecular Formula | C5H3N3O2S |
| Molecular Weight | 169.16 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Recommended for analytical method development and validation; each product is supplied with a full Certificate of Analysis (COA) ensuring ISO 17034 metrological traceability.
1H-Thieno[2,3-d][1,2,3]triazole-5-carboxylic acid (CAS 107166-05-2), molecular formula C5H3N3O2S and molecular weight 169.16 g/mol, is a CATO reference standard with documented purity and traceability.
Owing to an amide group, a sulfone group, a carboxylic acid group, a hydroxyl group, an ether linkage, 1H-Thieno[2,3-d][1,2,3]triazole-5-carboxylic acid is typically off-white to pale yellow crystalline powder. Its solid-state physicochemical attributes — including a molecular weight of 169.16 g/mol — guide the selection of appropriate sample preparation and analytical techniques. Nitrogen-containing functional groups confer excellent ionization efficiency in positive-ion electrospray (ESI) mode, making the compound well suited to LC-MS/MS analysis.
The assigned purity is verified by mass-balance and quantitative NMR (qNMR) approaches, with the expanded uncertainty reported at a 95% confidence level (k=2). Batch homogeneity and stability are independently assessed for every lot.
Physical & Chemical Properties
| Molecular Formula | C5H3N3O2S |
| Molecular Weight | 169.16 g/mol |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light, keep sealed and dry |
| Solubility (reference) | Soluble in DMSO, DMF, methanol |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light; Hygroscopic; reseal immediately after opening |
| Degree of Unsaturation (DBE) | 6.0 |
| UV Absorption | UV-absorbing |
| CAS Registry Year (est.) | 1987 |
| Nitrogen Atoms | 3 |
| Sulfur Atoms | 1 |
Related H Standards
- 2H-Thieno[2,3-d][1,3]oxazine-2,4(1H)-dione (CAS 103979-54-0)
- thieno[3,2-b]thiophen-2-ylmethanamine (CAS 874881-30-8)
- thieno[3,2-b]pyridine-6-carbonitrile (CAS 116538-95-5)
- thieno[2,3-b]pyridine-5-carbonitrile (CAS 21344-31-0)
- Thieno[2,3-d]pyrimidine-4-thiol (CAS 14080-55-8)
- thieno[3,2-d]pyrimidine-4-thiol (CAS 16229-24-6)
- Thieno[2,3-b]thiophene-2-carbaldehyde (CAS 31486-85-8)
- Thieno[3,2-b]thiophene-2-carbaldehyde (CAS 31486-86-9)
Recommended Standards
- N-(3-fluorophenyl)hydrazinecarboxamide (CAS 114670-74-5)
- Capmatinib Impurity 4 (CAS 1243392-80-4)
- (2-Aminophenyl)dimethylphosphine Oxide (CAS 1197953-47-1)
- Regorafenib Impurity 58 (CAS 103842-00-8)
- 5-(3-Fluorophenyl)-2-methylpyridine (CAS 713143-67-0)
- 2-chloro-7-fluoro-1-methyl-1H-1,3-benzodiazole (CAS 1283721-30-1)
- 2,6-Difluoro-N-phenethylbenzamide (CAS 314054-21-2)
- 5-Bromo-2-chloro-N-(1H-pyrazol-3-yl)pyrimidin-4-amine (CAS 1624261-76-2)
- 5-Nitro-3-pyrazolecarboxylic acid (CAS 198348-89-9)
- 1-Benzyl-4-(4-fluorophenyl)-1H-imidazol-5-amine (CAS 1016809-33-8)
- 5-chloro-2-methyl-[1,2,4]triazolo[1,5-c]pyrimidine (CAS 76044-37-6)
- 4-Cyclopropoxyphthalamide (CAS 1243408-80-1)
- N-(4-methoxybenzyl)thiazolidine-4-carboxamide hydrochloride (CAS 1827777-57-0)
- Semaglutide impurity 235 (CAS CATO-C4X-2226235)
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