4-Chloro-5,6,7-trimethoxyquinazoline CAS 55496-54-3
| CAS No. | 55496-54-3 |
| Molecular Formula | C11H11ClN2O3 |
| Molecular Weight | 254.67 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Under current pharmacopoeial and regulatory frameworks, quality-control requirements for this class of reference material explicitly involve the control of targets including 4-Chloro-5,6,7-trimethoxyquinazoline.
4-Chloro-5,6,7-trimethoxyquinazoline (CAS 55496-54-3), molecular formula C11H11ClN2O3 and molecular weight 254.67 g/mol, is a CATO reference standard with documented purity and traceability.
Structurally, 4-Chloro-5,6,7-trimethoxyquinazoline (C11H11ClN2O3) contains a nitrogen-containing heterocyclic scaffold, an amide group, a hydroxyl group, an ether linkage, chlorine substitution. The molecule exhibits a degree of unsaturation (DBE) of 7.0, corresponding to approximately 7 ring(s) or double-bond equivalent(s). With a molecular weight of 254.67 g/mol, it falls into the medium-molecular-weight range. 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.
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 | C11H11ClN2O3 |
| Molecular Weight | 254.67 g/mol |
| Appearance | Off-white to pale yellow crystalline powder. (slight halide-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 methanol, ethanol, DMSO |
| 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) | 7.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1972 |
| Halogen Content | Cl-containing |
| Nitrogen Atoms | 2 |
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Recommended Standards
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- 5-(4-Chloro-3,5-dimethyl-pyrazol-1-ylmethyl)-furan-2-carboxylic acid (CAS 312310-61-5)
- CAS 2230788-65-3 (CAS 2230788-65-3)
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- Methyl 5-Fluoroisoxazolo[4,5-b]pyrazine-3-carboxylate (CAS 1374986-06-7)
- 2,4-Bis(methylsulfonyl)-1-bromobenzene (CAS 1000018-15-4)
- Tau Peptide (274-288) trifluoroacetate salt (CAS 330456-39-8)
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