4-Chloro-1-ethyl-5-methyl-1H-pyrazole CAS 1172915-66-0
| CAS No. | 1172915-66-0 |
| Molecular Formula | C6H9ClN2 |
| Molecular Weight | 144.60 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-1-ethyl-5-methyl-1H-pyrazole.
4-Chloro-1-ethyl-5-methyl-1H-pyrazole (CAS 1172915-66-0), molecular formula C6H9ClN2 and molecular weight 144.60 g/mol, is a CATO reference standard with documented purity and traceability.
4-Chloro-1-ethyl-5-methyl-1H-pyrazole (C6H9ClN2) contains a nitrile group, chlorine substitution. Halogen substitution raises its density and boiling point; these physicochemical properties determine the optimal preparation and storage of its standard solutions. Halogen substitution (F/Cl/Br/I) produces a distinctive isotope pattern in mass spectrometry, a valuable aid for qualitative confirmation.
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.
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 | C6H9ClN2 |
| Molecular Weight | 144.60 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.) | 1989 |
| Halogen Content | Cl-containing |
| Nitrogen Atoms | 2 |
Related Chloro Standards
- 3-Chloro-1,4,5-trimethyl-1H-pyrazole (CAS 1036991-59-9)
- 2-Chloro-1-isopropyl-1h-imidazole (CAS 1053655-72-3)
- 4-Chloro-1-ethyl-3-methyl-1H-pyrazole (CAS 1172461-39-0)
- 6-chloro-6-methylbicyclo[3.1.0]hexan-2-one (CAS 117341-93-2)
- 5-chloro-1,3,4-trimethyl-1H-pyrazole (CAS 1195585-81-9)
- 3-Chloro-1-ethyl-5-methyl-1H-pyrazole (CAS 1195637-10-5)
- 4-Chloro-1-propyl-1H-pyrazole (CAS 1204901-63-2)
- 4-Chloro-1-isopropyl-1H-pyrazole (CAS 1205921-77-2)
Recommended Standards
- 3-(Chloromethyl)-1-ethyl-1H-pyrazole (CAS 1172973-66-8)
- 1-(2-Chloroethyl)-4-methyl-1H-pyrazole (CAS 1046861-53-3)
- 4-Chlorobenzaldehyde-2,3,5,6-d4 (CAS 62285-59-0)
- 2-Chlorobenzaldehyde-D4 (CAS 1093351-46-2)
- Tert-butyl ((1R,5S)-9-amino-3-oxabicyclo[3.3.1]Nonan-7-yl)carbamate (CAS 1638972-45-8)
- Ciguatoxin 3 (CAS 139341-09-6)
- (R)-2-(1,3-bis(benzyloxy)-1,3-dioxopropan-2-yl)-4-methylpentanoic acid (CAS 155947-71-0)
- 2-(4-Iodo-1H-pyrazol-1-yl)pyrimidine (CAS 852807-21-7)
- 3-(4-methoxyphenyl)piperazin-2-one (CAS 85607-62-1)
- Alfacalcidol Impurity N1 (CAS 71726-02-8)
- Isofenphos (CAS 25311-71-1)
- 1-(4-Hydroxyphenyl)-5-methyl-2-(3-(4-(4-methylpyridin-2-yl)piperazin-1-yl)propyl)-1H-pyrazol-3(2H)-one (CAS 104416-71-9)
- 3-Cyclopropyl-3-(4-methoxy-3-methylphenyl)propanoic acid (CAS 1017141-66-0)
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