Tolterodine Impurity 4 CAS 906532-18-1
| CAS No. | 906532-18-1 |
| Molecular Formula | C22H31NO |
| Molecular Weight | 325.49 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
Tolterodine Impurity 4 (CAS 906532-18-1) is a certified pharmaceutical impurity reference standard with the molecular formula C22H31NO and a molecular weight of 325.49 g/mol.
Tolterodine Impurity 4 (C22H31NO) contains a steroid core, an amide group, a hydroxyl group, an ether linkage. Its high carbon-to-hydrogen ratio confers good lipid solubility; these physicochemical properties determine the optimal preparation and storage of its standard solutions. 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).
This reference standard supports related-substances testing and method development in line with ICH Q3A/Q3B guidance on impurity control, and is suitable for system suitability testing and forced-degradation studies.
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 | C22H31NO |
| Molecular Weight | 325.49 g/mol |
| Appearance | Pale yellow to yellow crystalline powder |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light |
| Solubility (reference) | Soluble in chloroform, dichloromethane, ethyl acetate, DMSO |
| Stability | Light-sensitive; avoid direct strong light |
| Degree of Unsaturation (DBE) | 8.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1987 |
| Nitrogen Atoms | 1 |
Related Tolterodine Standards
- Tolterodine (CAS 124937-51-5)
- (S)-Tolterodine (CAS 124937-53-7)
- Tolterodine Impurity 39 (CAS CATO-C4X-176739)
- Tolterodine Acid N-Monodealkyl (as Racemate) (CAS 194482-43-4)
- Tolterodine impurity 38 (CAS CATO-C4X-176738)
- Tolterodine impurity 37 (CAS 1554029-91-2)
- Tolterodine impurity 36 (CAS 1391053-65-8)
- Tolterodine Acid (as Racemate) (CAS 194482-44-5)
Recommended Standards
- N-((4-Methoxytetrahydro-2H-thiopyran-4-yl)methyl)-3-(phenylthio)propanamide (CAS 2034398-80-4)
- Salmeterol Impurity 17 (CAS 94749-00-5)
- 8-Bromo-6-chloro-2-(difluoromethyl)imidazo[1,2-a]pyridine-3-carboxylic acid (CAS 2514942-12-0)
- 4-((Benzylamino)methyl)-2,6-di-tert-butylphenol (CAS 79126-41-3)
- Labetalol Impurity 10 (CAS CATO-C4X-246610)
- Domperidone Impurity 41 (CAS CATO-C4X-142041)
- Canagliflozin Impurity 95 (CAS 10388-25-7)
- N-(benzo[d]thiazol-2-yl)-1,2,3,4-tetrahydroisoquinoline-8-carboxamide 2hcl (CAS 1235034-72-6)
- 2-(Ethoxycarbonyl)-N-methylindole (CAS 18450-24-3)
- N-methyloctahydro-2H-quinolizin-1-amine (CAS 1423030-94-7)
- tert-Butyl (S)-2-(5-(6-bromonaphthalen-2-yl)-1H-imidazol-2-yl)pyrrolidine-1-carboxylate (CAS 1228551-96-9)
- N-(4-Bromo-3-methylphenyl)-2-fluorobenzamide (CAS 328262-28-8)
- 2-(4-(3-(3,4-Dimethylphenyl)ureido)phenyl)acetamide (CAS 1251560-34-5)
- Semaglutide Impurity 140 (CAS CATO-C4X-2226140)
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