4-Chloro-1-ethyl-1H-pyrazole CAS 1171076-88-2
| CAS No. | 1171076-88-2 |
| Molecular Formula | C5H7ClN2 |
| Molecular Weight | 130.58 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Owing to a nitrile group, chlorine substitution, 4-Chloro-1-ethyl-1H-pyrazole is typically white to pale yellow liquid. Its solid-state physicochemical attributes — including a molecular weight of 130.58 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-ethyl-1H-pyrazole (CAS 1171076-88-2), molecular formula C5H7ClN2 and molecular weight 130.58 g/mol, is a CATO reference standard with documented purity and traceability.
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.
As a certified reference material (CRM), 4-Chloro-1-ethyl-1H-pyrazole meets the metrological traceability requirements of ISO/IEC 17025 laboratories. Batch-to-batch consistency is monitored via control charts to guarantee comparable assigned values across lots.
Physical & Chemical Properties
| Molecular Formula | C5H7ClN2 |
| Molecular Weight | 130.58 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
- 2-Chloro-4,5-dimethyl-1h-imidazole (CAS 1049126-78-4)
- 5-Chloro-1,4-dimethyl-1H-pyrazole (CAS 127842-11-9)
- 5-Chloro-1-ethyl-1H-pyrazole (CAS 1427020-01-6)
- 4-Chloro-1,3-dimethyl-1H-pyrazole (CAS 15878-44-1)
- 4-Chloro-3,5-dimethyl-1H-pyrazole (CAS 15953-73-8)
- 4-Chloro-2,5-dimethyl-1H-imidazole (CAS 16265-08-0)
- 5-Chloro-1,4-dimethyl-1H-imidazole (CAS 1856095-84-5)
- 2-Chloro-1-ethyl-1H-imidazole (CAS 946061-13-8)
Recommended Standards
- 5-(1-Chloroethyl)-1H-imidazole (CAS 127171-35-1)
- Sorbic Chloride (CAS 2614-88-2)
- hex-5-ynoyl chloride (CAS 55183-45-4)
- 2-(2-Chloroethyl)-1H-imidazole (CAS 1341963-55-0)
- (αR)-7,8-Dihydro-α-methyl-N-[3-[3-(trifluoromethyl)phenyl]propyl]-1-naphthalenemethanamine (CAS 802918-35-0)
- 3-Bromo-2-chloro-5-(difluoromethyl)thiophene (CAS 2091608-75-0)
- 1,7-Naphthyridine (CAS 253-69-0)
- 5-Oxopyrrolidin-3-yl acetate (CAS 64097-45-6)
- tert-butyl 2-oxo-3,6-diazabicyclo[3.1.1]heptane-6-carboxylate (CAS 1273562-74-5)
- 3-(2,4-Difluorobenzyl)azetidine hydrochloride (CAS 1803600-15-8)
- tert-Butyl N-[(3S,4S)-3-hydroxypiperidin-4-yl]carbamate (CAS 724788-22-1)
- 2-{4-[2-(2,6-Difluoro-phenyl)-4,5-dihydro-oxazol-4-yl]-phenyl}-oxazole (CAS 1231482-74-8)
- 7-Chloro-4-oxo-1,4-dihydro-1,8-naphthyridine-3-carboxylic acid (CAS 54563-42-7)
- Semaglutide impurity 29 (CAS 110990-08-4)
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