5-Oxo-4,5-dihydropyrazolo[1,5-a]quinazoline-3-carboxylic acid CAS 25468-55-7
| CAS No. | 25468-55-7 |
| Molecular Formula | C11H7N3O3 |
| Molecular Weight | 229.19 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
This reference standard is suitable for quantitative analysis on major chromatographic platforms including HPLC, GC, LC-MS/MS, and GC-MS, serving as an external calibration standard or a system suitability test reference material.
CATO supplies 5-Oxo-4,5-dihydropyrazolo[1,5-a]quinazoline-3-carboxylic acid (CAS 25468-55-7), a certified reference material (molecular formula C11H7N3O3, MW 229.19 g/mol) for analytical method development and quality control.
5-Oxo-4,5-dihydropyrazolo[1,5-a]quinazoline-3-carboxylic acid (C11H7N3O3) contains an amino-acid-derived structure, an amide group, a hydroxyl group, an ether linkage. It is notably hygroscopic, the carboxyl group imparts weak acidity; these physicochemical properties determine the optimal preparation and storage of its standard solutions. Nitrogen-containing functional groups confer excellent ionization efficiency in positive-ion electrospray (ESI) mode, making the compound well suited to LC-MS/MS analysis.
CATO manufactures 5-Oxo-4,5-dihydropyrazolo[1,5-a]quinazoline-3-carboxylic acid under ISO 17034:2016 accreditation with dual CNAS and ANAB accreditation. Each batch is characterized by orthogonal methods and supplied with a full Certificate of Analysis (COA), ensuring metrological traceability.
Physical & Chemical Properties
| Molecular Formula | C11H7N3O3 |
| Molecular Weight | 229.19 g/mol |
| Appearance | Pale yellow to yellow crystalline powder |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light, keep sealed and dry |
| Solubility (reference) | Soluble in methanol, ethanol, DMSO |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light; Hygroscopic; reseal immediately after opening |
| Degree of Unsaturation (DBE) | 10.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1964 |
| Nitrogen Atoms | 3 |
Related Oxo Standards
- 5-Methyl-6,7-dihydropyrazolo[1,5-a]thieno[3,2-e]pyrimidine-3-carbonitrile (CAS 866145-04-2)
- 8-Phenyl-4,9-dihydropyrazolo[1,5-d][1,2,4]triazinone (CAS 135131-00-9)
- 2-Phenyl-6,7-dihydropyrazolo[1,5-a]pyrazin-4(5H)-one (CAS 1246552-68-0)
- 8-methyl-5,6-dihydropyrazolo[3,4-h]quinazolin-2-amine (CAS 2526004-19-1)
- 5-Oxo-4,5-dihydropyrazolo[1,5-a]quinazoline-3-carbonitrile (CAS 124570-55-4)
- 1,10b-dihydropyrazolo[1,5-c]quinazoline-5-thiol (CAS 59553-09-2)
- 5-Methyl-4,5-dihydropyrazolo[3,4-e][1,2,4]thiadiazin-3(2H)-one 1,1-dioxide (CAS 1708401-57-3)
- 5-Oxo-4,5-dihydropyrazolo[1,5-a]pyrimidine-2-carboxylic acid (CAS 197367-83-2)
Recommended Standards
- 5-Methylfuro[3,2-c]quinoline-2,3,4(5H)-trione (CAS 666234-41-9)
- 7-(Furan-2-yl)pyrazolo[1,5-a]pyrimidine-2-carboxylic acid (CAS 869947-19-3)
- 5-Amino-1-(4-nitrophenyl)pyrazole-4-carbonitrile (CAS 5394-41-2)
- 7-(Furan-2-yl)pyrazolo[1,5-a]pyrimidine-3-carboxylic acid (CAS 869947-18-2)
- 3-Iodo-5-methoxy-6-methyl-1H-indazole (CAS 1000343-52-1)
- Ethyl 2-{[(5E)-5-{[4-(acetyloxy)phenyl]methylidene}-4-oxo-4,5-dihydro-1,3-thiazol-2-yl]sulfanyl}acetate (CAS 1164520-32-4)
- 4-((3-(Benzyloxy)benzylidene)amino)-3-(m-tolyl)-1H-1,2,4-triazole-5(4H)-thione (CAS 478255-62-8)
- S-Benzyl-L-cysteinol (CAS 85803-43-6)
- N-(3-methoxypropyl)-2-nitrobenzamide (CAS 347907-34-0)
- 1356074-44-6 3-Pyridinecarbonitrile, 5-bromo-2-(4-hydroxy-1-piperidinyl)- (CAS 1356074-44-6)
- 1-(3-Chloro-5-(trifluoromethyl)pyridin-2-yl)-N-((4-methoxyphenyl)carbamothioyl)-1H-pyrrole-2-carboxamide (CAS 338420-75-0)
- 4-bromo-2-methyl-pyrazolo[3,4-c]pyridine (CAS 2177257-61-1)
- N-(2-aminophenyl)-1-(2,2-dichlorocyclopropyl)methanesulfonamide (CAS 1146290-04-1)
- Peptide Impurity 05 (CAS 2322924-83-2)
Why CATO?
- ISO 17034 accredited reference material producer (CNAS + ANAB dual accreditation)
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