Cyclopenta[c]pyrazole CAS 250-39-5
| CAS No. | 250-39-5 |
| Molecular Formula | C6H4N2 |
| Molecular Weight | 104.11 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
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.
Cyclopenta[c]pyrazole (CAS 250-39-5), molecular formula C6H4N2 and molecular weight 104.11 g/mol, is a CATO reference standard with documented purity and traceability.
Owing to a nitrile group, an aromatic ring system, Cyclopenta[c]pyrazole is typically off-white to pale yellow liquid. Its solid-state physicochemical attributes — including a molecular weight of 104.11 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.
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.
Physical & Chemical Properties
| Molecular Formula | C6H4N2 |
| Molecular Weight | 104.11 g/mol |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light |
| Solubility (reference) | Soluble in DMSO, DMF, methanol |
| Stability | Light-sensitive; avoid direct strong light |
| Degree of Unsaturation (DBE) | 6.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1957 |
| Nitrogen Atoms | 2 |
Related Cyclopenta Standards
- Cyclopenta[b]pyrrole (CAS 250-36-2)
- Cyclopenta[c]pyrrole (CAS 250-26-0)
- Cyclopenta-1,3-diene-1-carboxylic acid (CAS 85004-15-5)
- 2-(Cyclopenta-1,3-dien-1-yl)ethan-1-ol (CAS 66612-66-6)
- 4660-80-4 5-(3-cyclopenta-2,4-dien-1-ylpropyl)cyclopenta-1,3-diene; titanium(4+); dichloride 5-[3-(1-cyclopenta-2,4-dienyl)propyl]cyclopenta-1,3-diene; titanium(4+); dichloride A827085 (CAS 4660-80-4)
- 1H-Cyclopenta[b]pyridine (CAS 270-88-2)
- 5H-Cyclopenta[b]pyridine (CAS 270-91-7)
- 5H-Cyclopenta[c]pyridine (CAS 270-60-0)
Recommended Standards
- 3-Hydroxypropanehydrazide (CAS 24535-11-3)
- Hydrochlorothiazide Impurity 34 (CAS 250-72-6)
- 3-hydroxy-1,1-dimethylurea (CAS 52253-32-4)
- L-2,3-Diaminopropionic acid (CAS 4033-39-0)
- 1-(4-Fluoro-3-methylphenyl)prop-2-en-1-amine (CAS 1270480-81-3)
- Tert-butyl n-[(3-fluoro-4-formylphenyl)methyl]carbamate (CAS 1372096-37-1)
- 4-(4-Chlorophenyl)-N,N-dimethylpiperazine-1-sulfonamide (CAS 339008-95-6)
- 4-((2-Formyl-1H-pyrrol-1-yl)methyl)benzoic acid (CAS 1083350-94-0)
- 2-(4-(4-Chlorophenyl)-2-methyl-3-oxo-1,2,4-oxadiazolidin-5-yl)-N,N-diisopropylacetamide (CAS 478063-82-0)
- Benzo[d]oxazol-2-yl(phenyl)methanamine (CAS 13591-17-8)
- Geranylacetone（mixture of (E)- and (Z)- isomers） (CAS 689-67-8)
- 3,4-Difluoro-4-(4-methylpiperazinomethyl) benzophenone (CAS 898763-36-5)
- p-Decyloxyaniline (CAS 39905-47-0)
- Semaglutide Impurity 75 (CAS CATO-C4X-2226175)
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