Phenylphosphonic acid CAS 1571-33-1
| CAS No. | 1571-33-1 |
| Molecular Formula | C6H7O3P |
| Molecular Weight | 158.09 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
The occurrence of Phenylphosphonic acid is closely related to a phosphonate group, a carboxylic acid group, a hydroxyl group, an ether linkage in its molecular formula, which determines its behaviour during synthesis, purification, or degradation.
Phenylphosphonic acid (CAS 1571-33-1), molecular formula C6H7O3P and molecular weight 158.09 g/mol, is a CATO reference standard with documented purity and traceability.
Structurally, Phenylphosphonic acid (C6H7O3P) contains a phosphonate group, a carboxylic acid group, a hydroxyl group, an ether linkage. The molecule exhibits a degree of unsaturation (DBE) of 3.5, corresponding to approximately 3 ring(s) or double-bond equivalent(s). With a molecular weight of 158.09 g/mol, it falls into the medium-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), Phenylphosphonic acid 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 | C6H7O3P |
| Molecular Weight | 158.09 g/mol |
| Purity | 97%+ |
| Storage | Store at 2-8°C, keep sealed and dry |
| Solubility (reference) | Soluble in methanol, ethanol, DMSO, water |
| Stability | May oxidize slowly on prolonged air exposure; Hygroscopic; reseal immediately after opening |
| Degree of Unsaturation (DBE) | 3.5 |
| UV Absorption | UV-absorbing |
| CAS Registry Year (est.) | 1957 |
Related Phenylphosphonic Standards
Recommended Standards
- 5-fluoro-2-nitropyridine 1-oxide (CAS 935753-02-9)
- Favipiravir Impurity 9 (CAS 1079990-21-8)
- phenyl dihydrogen phosphite (CAS 3486-75-7)
- 4-Methoxybenzoic acid-phenyl-<SUP>13</SUP>C<SUB>6</SUB> (CAS 1173022-97-3)
- Benzyl (R)-piperidine-2-carboxylate hydrochloride (CAS 34465-67-3)
- 1-(Octan-2-yl)-1H-pyrazol-4-amine (CAS 1240570-54-0)
- 4-Benzyl-2,2,6,6-Tetramethylmorpholine (CAS 58607-28-6)
- 1,3-Diazepane-2,4-dione (CAS 75548-99-1)
- Moxonidine EP Impurity D (CAS 352457-33-1)
- 4,6-Diphenylpyridazin-3(2H)-one (CAS 2166-00-9)
- 2-Deoxyuridine-1- (CAS 478510-85-9)
- Abemaciclib Impurity N2 (CAS 1231930-29-2)
- N-(4-Isobutyl-2-methyloxazol-5-yl)benzamide (CAS 87783-88-8)
- Semaglutide impurity 39 (CAS CATO-C4X-222639)
Why CATO?
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