Methyl 4-chlorobut-2-ynoate CAS 41658-12-2
| CAS No. | 41658-12-2 |
| Molecular Formula | C5H5ClO2 |
| Molecular Weight | 132.55 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 Methyl 4-chlorobut-2-ynoate.
Methyl 4-chlorobut-2-ynoate (CAS 41658-12-2), molecular formula C5H5ClO2 and molecular weight 132.55 g/mol, is a CATO reference standard with documented purity and traceability.
Structurally, Methyl 4-chlorobut-2-ynoate (C5H5ClO2) contains a carboxylic acid group, a hydroxyl group, an ether linkage, chlorine substitution. The molecule exhibits a degree of unsaturation (DBE) of 3.0, corresponding to approximately 3 ring(s) or double-bond equivalent(s). With a molecular weight of 132.55 g/mol, it falls into the low-molecular-weight range. The presence of an aromatic ring or conjugated system gives the compound characteristic absorption bands in the UV-Vis region, making it well suited to UV or diode-array detection (DAD).
Recommended for analytical method development and validation; each product is supplied with a full Certificate of Analysis (COA) ensuring ISO 17034 metrological traceability.
As a certified reference material (CRM), Methyl 4-chlorobut-2-ynoate 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 | C5H5ClO2 |
| Molecular Weight | 132.55 g/mol |
| Purity | 97%+ |
| Storage | Store at 2-8°C, keep tightly closed to prevent evaporation |
| Solubility (reference) | Soluble in methanol, acetonitrile, DMSO, water (slightly soluble) |
| Stability | May oxidize slowly on prolonged air exposure; Contains ester bond; hydrolyzes under strong alkaline conditions |
| Degree of Unsaturation (DBE) | 3.0 |
| UV Absorption | UV-absorbing |
| CAS Registry Year (est.) | 1968 |
| Halogen Content | Cl-containing |
Related Methyl Standards
- methyl 2-chlorobut-3-enoate (CAS 51171-63-2)
- 4-Chlorobut-2-enoyl chloride (CAS 24806-06-2)
- 4-chlorobut-2-enoic acid (CAS 16197-90-3)
- (E)-4-chlorobut-2-enoic acid (CAS 26340-58-9)
- 2-Chlorobut-3-enoic acid (CAS 24253-33-6)
- 3-Chlorobut-2-enoic acid (CAS 55831-56-6)
- N-(4-Chlorobut-2-yn-1-yl)acetamide (CAS 29052-82-2)
- [(4-Chlorobut-2-yn-1-yl)sulfanyl]carbonitrile (CAS 113079-33-7)
Recommended Standards
- But-2-yn-1-yl carbonochloridate (CAS 202591-85-3)
- 4-Chlorophenol-d4 (CAS 344298-84-6)
- 5-Chlorofuran-2-methanol (CAS 27230-59-7)
- 2-Chlorophenol D4 (3,4,5,6 D4) (CAS 93951-73-6)
- (4-Octylbenzyl)triphenylphosphonium chloride (CAS 62640-29-3)
- (S)-3,4-dihydro-2H-pyrano[2,3-b]pyridin-4-ol (CAS 1932479-56-5)
- tert-Butyl ((5-methylpyrimidin-2-yl)methyl)carbamate (CAS 930272-56-3)
- 2-Chloro-6-methyl-3-nitroaniline (CAS 183128-66-7)
- 3-(3-Chloro-4-methoxyphenyl)propan-1-ol (CAS 1000551-83-6)
- 5-hexenoic acid (CAS 1577-22-6)
- 1-(4-(((2-Hydroxyethyl)(isopropyl)amino)methyl)piperidin-1-yl)ethanone (CAS 1353944-55-4)
- 121082-86-8 5-(Bromomethyl)-3-(4-methoxyphenyl)-1,3-oxazolidin-2-one DTXSID40569303 (CAS 121082-86-8)
- Denatonium Hydroxide (CAS 222608-06-2)
- Semaglutide Impurity 162 (x TFA Salt) (CAS CATO-C4X-2226162)
Why CATO?
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