4-Chloro-1-methylpyrazole CAS 35852-81-4
| CAS No. | 35852-81-4 |
| Molecular Formula | C4H5ClN2 |
| Molecular Weight | 116.55 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Owing to a nitrile group, chlorine substitution, 4-Chloro-1-methylpyrazole is typically white to pale yellow liquid. Its solid-state physicochemical attributes — including a molecular weight of 116.55 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.
4-Chloro-1-methylpyrazole (CAS 35852-81-4), molecular formula C4H5ClN2 and molecular weight 116.55 g/mol, is a CATO reference standard with documented purity and traceability.
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 | C4H5ClN2 |
| Molecular Weight | 116.55 g/mol |
| 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) | 3.0 |
| UV Absorption | UV-absorbing |
| CAS Registry Year (est.) | 1967 |
| Halogen Content | Cl-containing |
| Nitrogen Atoms | 2 |
Related Chloro Standards
- 1092682-87-5 4-CHLORO-3-METHYL-1H-PYRAZOLE SC-32661 (CAS 1092682-87-5)
- 3-Chloro-4-methyl-1H-pyrazole (CAS 134589-56-3)
- 4-Chloro-3-methyl-1H-pyrazole (CAS 15878-08-7)
- 5-Chloro-3-methyl-1H-pyrazole (CAS 15953-45-4)
- 4-Chloro-2-methyl-1H-imidazole (CAS 16265-06-8)
- 2-Chloro-5-methyl-1h-imidazole (CAS 909086-61-9)
- 3-Chloro-1-methyl-1H-pyrazole (CAS 63425-54-7)
- 5-Chloro-1-methyl-1H-pyrazole (CAS 42110-76-9)
Recommended Standards
- 3-Chlorocyclopent-2-en-1-one (CAS 53102-14-0)
- 5-Chloro-1-methylimidazole (CAS 872-49-1)
- 3-(Chloromethyl)pyrazole Hydrochloride (CAS 69658-97-5)
- Pent-4-ynoyl chloride (CAS 55183-44-3)
- 2704AF 3-(2-Chloro-5-methylphenoxy)piperidine 902837-30-3 C12H16ClNO (CAS 902837-30-3)
- 6-(3-Bromophenoxy)pyridin-3-amine (CAS 954567-75-0)
- 2-((2,6-Dichlorobenzyl)thio)-4-(4-methoxyphenyl)-6-(p-tolyl)nicotinonitrile (CAS 444155-65-1)
- (5-Chloro-1-propyl-1H-benzo[d]imidazol-2-yl)methanamine (CAS 1179254-77-3)
- 1-Bromo-3-chloro-5,5-dimethylimidazolidine-2,4-dione (CAS 16079-88-2)
- 5-Cyclopropyl-1,3,4-oxadiazole-2-carboxylate lithium salt (CAS 1523571-22-3)
- Ethyl 3-(3-chlorophenyl)-5-methylisoxazole-4-carboxylate (CAS 495417-28-2)
- tert-butyl (5aS,8aR)-octahydro-2H-pyrrolo[3,4-b][1,4]oxazepine-7-carboxylate (CAS 2165690-58-2)
- 8-(4-Bromophenyl)-N,N-dimethyl-1,4-dioxaspiro[4.5]decan-8-amine (CAS 71368-46-2)
- Peptide Impurity 40 (CAS CATO-CPTD788840)
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