2,4-Dichloro-5,6,7,8-tetrahydropyrido[4,3-d]pyrimidine CAS 726697-13-8
| CAS No. | 726697-13-8 |
| Molecular Formula | C7H7Cl2N3 |
| Molecular Weight | 204.06 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.
2,4-Dichloro-5,6,7,8-tetrahydropyrido[4,3-d]pyrimidine (CAS 726697-13-8), molecular formula C7H7Cl2N3 and molecular weight 204.06 g/mol, is a CATO reference standard with documented purity and traceability.
Structurally, 2,4-Dichloro-5,6,7,8-tetrahydropyrido[4,3-d]pyrimidine (C7H7Cl2N3) contains a nitrile group, chlorine substitution, an aromatic ring system. The molecule exhibits a degree of unsaturation (DBE) of 5.0, corresponding to approximately 5 ring(s) or double-bond equivalent(s). With a molecular weight of 204.06 g/mol, it falls into the medium-molecular-weight range. The presence of an aromatic ring or conjugated system gives the compound characteristic absorption bands in the UV-Vis region, making it well suited to UV or diode-array detection (DAD).
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 | C7H7Cl2N3 |
| Molecular Weight | 204.06 g/mol |
| Appearance | Off-white to pale yellow crystalline powder. (slight halide-like odor, faint amine-like odor, low volatility) |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light, 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 |
| Degree of Unsaturation (DBE) | 5.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1986 |
| Halogen Content | Cl-containing |
| Nitrogen Atoms | 3 |
Related Dichloro Standards
- 2,4-Dichloro-5,6,7,8-tetrahydropyrido[3,4-d]pyrimidine (CAS 1000578-08-4)
- 3-(4,5-Dichloro-3-methyl-1h-pyrazol-1-yl)propanenitrile (CAS 1001500-81-7)
- 2,4-Dichloro-5,6,7,8-tetrahydro-pyrido[3,2-d]pyrimidine (CAS 1260669-81-5)
- (S)-2,4-dichloro-6-methyl-6,7-dihydro-5H-pyrrolo[2,3-d]pyrimidine (CAS 1417287-56-9)
- 2,4-Dichloro-5-methyl-6,7-dihydro-5H-pyrrolo[2,3-d]pyrimidine (CAS 1651890-99-1)
- 2,4-Dichloro-5,6,7,8-tetrahydropyrido[2,3-d]pyrimidine (CAS 856970-31-5)
- 2,6-Dichloro-N-cyclopropylpyrimidin-4-amine (CAS 270929-28-7)
- 4,6-Dichloro-2-cyclopropylpyrimidin-5-amine (CAS 75438-70-9)
Recommended Standards
- 2-(Bromomethyl)-5-isopropyloxazole (CAS 2126177-77-1)
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- 1-Bromo-1-cyano-3,3-dimethylbutan-2-one (CAS 89563-44-0)
- 4-(2-Bromoethyl)-3,5-dimethylisoxazole (CAS 83467-35-0)
- 1-Phenethyl-1H-benzo[d]imidazol-5-amine dihydrochloride (CAS 1179363-13-3)
- 3-Diethylamino Acetaminophen-d10 (CAS 1794789-22-2)
- 2-(4-(4-Chlorophenyl)piperazin-1-yl)-2-(thiophen-2-yl)acetic acid (CAS 885276-92-6)
- ((2S,3S)-2-(4-Fluoro-2-methylphenyl)pyrrolidin-3-yl)methanol (CAS 815631-71-1)
- 1-(1-Adamantylmethyl)pyrrolidin-2-one (CAS 696649-98-6)
- Abemaciclib Impurity 176 (CAS CATO-C4X-2937176)
- 4-(3-Iodobenzoyl)benzonitrile (CAS 890098-65-4)
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