7-bromo-5-ethyl-1H-pyrazolo[4,3-d]pyrimidine-3-carboxylic acid CAS 1781908-69-7
| CAS No. | 1781908-69-7 |
| Molecular Formula | C8H15BrN4O2 |
| Molecular Weight | 279.13 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
As a certified reference material (CRM), 7-bromo-5-ethyl-1H-pyrazolo[4,3-d]pyrimidine-3-carboxylic 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.
7-bromo-5-ethyl-1H-pyrazolo[4,3-d]pyrimidine-3-carboxylic acid (CAS 1781908-69-7), molecular formula C8H15BrN4O2 and molecular weight 279.13 g/mol, is a CATO reference standard with documented purity and traceability.
Owing to an amide group, a carboxylic acid group, a hydroxyl group, an ether linkage, bromine substitution, 7-bromo-5-ethyl-1H-pyrazolo[4,3-d]pyrimidine-3-carboxylic acid is typically white to pale yellow crystalline powder. Its solid-state physicochemical attributes — including a molecular weight of 279.13 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.
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.
Physical & Chemical Properties
| Molecular Formula | C8H15BrN4O2 |
| Molecular Weight | 279.13 g/mol |
| Appearance | White to pale yellow crystalline powder. (slight halide-like odor, faint amine-like odor) |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light, keep sealed and dry, keep tightly closed to prevent evaporation |
| 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; Contains ester bond; hydrolyzes under strong alkaline conditions |
| Degree of Unsaturation (DBE) | 3.0 |
| UV Absorption | UV-absorbing |
| CAS Registry Year (est.) | 1994 |
| Halogen Content | Br-containing |
| Nitrogen Atoms | 4 |
Related bromo Standards
- Ethyl 3-bromo-2-naphthoate (CAS 1013915-73-5)
- n-(4-Bromo-3-methylphenyl)-1h-pyrrole-2-carboxamide (CAS 1094224-17-5)
- (3-Bromo-4,5-dihydro-isoxazol-5-ylmethyl)-carbamic acid tert-butyl ester (CAS 109770-82-3)
- 4-Bromo-2-(3,5-dimethyl-1h-pyrazol-1-yl)benzaldehyde (CAS 1152645-10-7)
- 2-{[(4-bromo-2-fluorophenyl)methyl]sulfanyl}acetic acid (CAS 1155604-85-5)
- 5-Bromo-N-(4-methoxyphenyl)-2-pyridinamine (CAS 1220020-51-8)
- 2-(4-Bromo-3,5-dimethyl-1h-pyrazol-1-yl)benzaldehyde (CAS 1249321-90-1)
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Recommended Standards
- 1-[(6-bromonaphthalen-2-yl)oxy]propan-2-one (CAS 173301-08-1)
- 5-Bromo-6-(4-methoxyphenyl)-pyridin-2-ylamine (CAS 1817741-88-0)
- 1-(6-Bromo-2-methoxynaphthalen-1-yl)ethan-1-one (CAS 169295-55-0)
- 3-(Benzyloxy)-5-bromophenol (CAS 1823803-79-7)
- 2-(4,5-Dicyano-1H-imidazol-1-yl)acetic acid (CAS 94512-79-5)
- 1,6-Hexanediamine, N1-(6-aminohexyl)-, homopolymer (CAS 67875-37-0)
- 3-Ethoxyphenylboronic Acid (CAS 90555-66-1)
- 2-(4-Bromophenyl)-2-ethylcyclopropan-1-amine hydrochloride (CAS 1423031-27-9)
- Ambroxol impurity 113 (CAS 131417-90-8)
- 7-Bromo-3-(difluoromethyl)quinoline (CAS 1207747-91-8)
- Ethyl 2-(4-formyl-3,5-dimethyl-1h-pyrazol-1-yl)acetate (CAS 1155592-25-8)
- (R)-3-Methyltetrahydro-4H-thiopyran-4-one 1,1-dioxide (CAS 2756575-41-2)
- 3-(4-Bromophenyl)quinazoline-2,4(1H,3H)-dithione (CAS 676154-37-3)
- D-Ala18-Tirzepatide (CAS CATO-CPTD788916)
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