1,7-Dichloro-1,1,3,3,5,5,7,7-octamethyltetrasiloxane CAS 2474-02-4
| CAS No. | 2474-02-4 |
| Molecular Formula | C8H24Cl2O3Si4 |
| Molecular Weight | 351.52 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Compared with other compounds in its class, the molecular weight of 351.52 g/mol gives 1,7-Dichloro-1,1,3,3,5,5,7,7-octamethyltetrasiloxane distinctive chromatographic separation conditions and mass-spectrometry parameter settings.
1,7-Dichloro-1,1,3,3,5,5,7,7-octamethyltetrasiloxane (CAS 2474-02-4), molecular formula C8H24Cl2O3Si4 and molecular weight 351.52 g/mol, is a CATO reference standard with documented purity and traceability.
The molecular framework of 1,7-Dichloro-1,1,3,3,5,5,7,7-octamethyltetrasiloxane (C8H24Cl2O3Si4) is characterized by a carboxylic acid group, a hydroxyl group, an ether linkage, chlorine substitution. In reversed-phase chromatography, its retention is governed primarily by the polarity and ionization state of its functional groups, which provides a practical basis for HPLC-UV/DAD or LC-MS method development. Halogen substitution (F/Cl/Br/I) produces a distinctive isotope pattern in mass spectrometry, a valuable aid for qualitative confirmation.
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), 1,7-Dichloro-1,1,3,3,5,5,7,7-octamethyltetrasiloxane 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 | C8H24Cl2O3Si4 |
| Molecular Weight | 351.52 g/mol |
| Purity | 97%+ |
| Storage | Store in a cool place (≤25°C), keep sealed and dry |
| Solubility (reference) | Soluble in methanol, ethanol, DMSO |
| Stability | Hygroscopic; reseal immediately after opening; Contains ester bond; hydrolyzes under strong alkaline conditions |
| Degree of Unsaturation (DBE) | -4.0 |
| CAS Registry Year (est.) | 1957 |
| Halogen Content | Cl-containing |
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