4-Chloro-1-ethynyl-2-methylbenzene CAS 74331-71-8
| CAS No. | 74331-71-8 |
| Molecular Formula | C9H7Cl |
| Molecular Weight | 150.60 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
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.
4-Chloro-1-ethynyl-2-methylbenzene (CAS 74331-71-8), molecular formula C9H7Cl and molecular weight 150.60 g/mol, is a CATO reference standard with documented purity and traceability.
Based on its molecular formula C9H7Cl, 4-Chloro-1-ethynyl-2-methylbenzene contains chlorine substitution, an aromatic ring system; these features give the compound characteristic absorption bands in UV spectroscopy. The molecular weight of 150.60 g/mol is directly relevant to the identification of the molecular ion in mass spectrometry. Halogen substitution (F/Cl/Br/I) produces a distinctive isotope pattern in mass spectrometry, a valuable aid for qualitative confirmation.
As a certified reference material (CRM), 4-Chloro-1-ethynyl-2-methylbenzene 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 | C9H7Cl |
| Molecular Weight | 150.60 g/mol |
| Appearance | Off-white to pale yellow crystalline powder. (slight halide-like odor) |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light, keep tightly closed to prevent evaporation |
| Solubility (reference) | Soluble in methanol, acetonitrile, DMSO |
| Stability | May oxidize slowly on prolonged air exposure; 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.) | 1978 |
| Halogen Content | Cl-containing |
Related Chloro Standards
- 1-Chloro-4-ethynyl-2-methylbenzene (CAS 1204394-34-2)
- 2-Chloro-1-ethynyl-3-methylbenzene (CAS 1233501-73-9)
- 2-Chloro-1-ethynyl-4-methylbenzene (CAS 1233520-92-7)
- (2S)-2-chloro-3-methylpentanoic acid (CAS 1237830-70-4)
- 1-Chloro-2-(prop-2-yn-1-yl)benzene (CAS 1312713-20-4)
- 2-Chloro-4-ethynyl-1-methylbenzene (CAS 1338235-62-3)
- 1-Chloro-3-ethynyl-2-methylbenzene (CAS 1342063-35-7)
- 4-Chloro-2-methylbutyric acid methyl ester (CAS 13888-03-4)
Recommended Standards
- 3-Methylbutan-2-yl chloroformate (CAS 20412-37-7)
- 4-Chloro-2-ethynyl-1-methylbenzene (CAS 74331-72-9)
- 3-Chlorobutyl acetate (CAS 2203-36-3)
- 4-Chloroindene (CAS 74124-87-1)
- D-Glucosamine-2-sulfate sodium salt (CAS 38899-05-7)
- (S)-4-methyl-2-(1H-tetrazol-1-yl)pentanoic acid (CAS 1218436-73-7)
- 2,7-Dimethylacridine (CAS 88844-42-2)
- N-((3-methylfuran-2-yl)methyl)thietan-3-amine (CAS 1881752-57-3)
- Ethyl N-[(1H-pyrazol-3-ylamino)thioxomethyl]carbamate (CAS 34683-00-6)
- 2-(4-(2-Fluorophenyl)-1H-pyrazol-1-yl)propanoic acid (CAS 1394023-95-0)
- 2-Methyl-3-(pyrrolidin-1-yl)propan-1-ol (CAS 873376-29-5)
- Furo[3,2-c]pyridine-7-carboxylic Acid (CAS 603302-86-9)
- Lucanthone-API (CAS 479-50-5)
- 149471-11-4 Neuropeptide DF2 L-Phenylalaninamide, L-alpha-aspartyl-L-arginyl-L-asparaginyl-L-phenylalanyl-L-leucyl-L-arginyl- Asp-arg-asn-phe-leu-arg-phe-NH2 Aspartyl-arginyl-asparaginyl-phenylalanyl-leucyl-arginyl-phenylalaninamide L-alpha-Aspartyl-L-arginyl-L-asparaginyl-L-phenylalanyl-L-leucyl-L-arginyl-L-phenylalaninamide DF(2) Neuropeptide Drnflrfamide (CAS 149471-11-4)
Why CATO?
- ISO 17034 accredited reference material producer (CNAS + ANAB dual accreditation)
- 130,000+ catalog items in stock, COA supplied with every batch
- Worldwide shipping with full export documentation (HS code guidance available)
- Technical support: +86 18665070610 / Nicole.chen@cato-chem.com