2-Chlorobenzo[d]oxazol-5-ol CAS 950644-38-9
| CAS No. | 950644-38-9 |
| Molecular Formula | C7H4ClNO2 |
| Molecular Weight | 169.57 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
As a certified reference material (CRM), 2-Chlorobenzo[d]oxazol-5-ol 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.
2-Chlorobenzo[d]oxazol-5-ol (CAS 950644-38-9), molecular formula C7H4ClNO2 and molecular weight 169.57 g/mol, is a CATO reference standard with documented purity and traceability.
The molecular framework of 2-Chlorobenzo[d]oxazol-5-ol (C7H4ClNO2) is characterized by an amide group, a carboxylic acid group, a hydroxyl group, an ether linkage, chlorine substitution, an aromatic ring system. In reversed-phase chromatography, its retention is governed primarily by the protonation state of its nitrogen-containing groups, which provides a practical basis for HPLC-UV/DAD or LC-MS method development. 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 | C7H4ClNO2 |
| Molecular Weight | 169.57 g/mol |
| Appearance | Off-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 tightly closed to prevent evaporation |
| Solubility (reference) | Soluble in methanol, acetonitrile, DMSO, water (slightly soluble) |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light; Contains ester bond; hydrolyzes under strong alkaline conditions |
| Degree of Unsaturation (DBE) | 6.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1987 |
| Halogen Content | Cl-containing |
| Nitrogen Atoms | 1 |
Related Chlorobenzo Standards
- 3-Chlorobenzo[d]isoxazol-7-ol (CAS 155645-24-2)
- 4-Chlorobenzo[c]isoxazol-3(1H)-one (CAS 1781106-73-7)
- 2-Chlorobenzo[d]oxazol-7-ol (CAS 1781434-25-0)
- 7-Chlorobenzo[c]isoxazol-3(1H)-one (CAS 1785505-32-9)
- 4-Chlorobenzo[d]isoxazol-3(2H)-one (CAS 178748-22-6)
- 6-Chlorobenzo[d]isoxazol-5-ol (CAS 184766-64-1)
- 2-Chlorobenzo[d]oxazol-4-ol (CAS 950644-37-8)
- 2-Chlorobenzo[d]oxazol-6-ol (CAS 256519-02-5)
Recommended Standards
- 2-Chloro-9H-purin-6-amine (CAS 31458-56-7)
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- 2-Chloro-3H-pyrrolo[3,2-d]pyrimidin-4(5H)-one (CAS 90993-29-6)
- 3-CHloro-4h-pyrazolo[1,5-a]pyrimidin-7-one (CAS 2092929-92-3)
- Tris(1-chloro-2-propyl) Phosphate-d18 (CAS 1447569-78-9)
- 2-(Dimethylamino)-5-methylpyrimidine-4,6-diol (CAS 65399-50-0)
- 5-[3-(Trifluoromethyl)phenyl]-2-({[3-(trifluoromethyl)phenyl]methyl}sulfanyl)pyrimidine (CAS 339101-73-4)
- Ethyl 7-bromo-1-methyl-1,2,3-benzotriazole-5-carboxylate (CAS 1423037-30-2)
- Amlodipine 131 (CAS CATO-C4X-1095131)
- 2-(Methylthio)-1H-benzo[d]imidazol-1-amine (CAS 151693-49-1)
- 2-((2-Aminoethyl)amino)anthracene-9,10-dione hydrochloride (CAS 57524-50-2)
- 3-Ethyl-5-fluoro-1H-pyrrolo[2,3-b]pyridine (CAS 1068976-42-0)
- N-(2-(N-Cyclohexylsulfamoyl)ethyl)benzo[d][1,3]dioxole-5-carboxamide (CAS 899740-36-4)
- Hexapeptide-10 (CAS 146439-94-3)
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