3-(o-Tolyl)dihydro-2H-pyran-2,6(3H)-dione CAS 1136-23-8
| CAS No. | 1136-23-8 |
| Molecular Formula | C21H31O2P2S |
| Molecular Weight | N/A |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Recommended for analytical method development and validation; each product is supplied with a full Certificate of Analysis (COA) ensuring ISO 17034 metrological traceability.
3-(o-Tolyl)dihydro-2H-pyran-2,6(3H)-dione (CAS 1136-23-8), molecular formula C21H31O2P2SCl and molecular weight 444.94 g/mol, is a CATO reference standard with documented purity and traceability.
Owing to a steroid core, a sulfone group, organophosphorus functionality, a hydroxyl group, an ether linkage, chlorine substitution, 3-(o-Tolyl)dihydro-2H-pyran-2,6(3H)-dione is typically off-white to pale yellow crystalline powder. Its solid-state physicochemical attributes — including a molecular weight of 444.94 g/mol — guide the selection of appropriate sample preparation and analytical techniques. Halogen substitution (F/Cl/Br/I) produces a distinctive isotope pattern in mass spectrometry, a valuable aid for qualitative confirmation.
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.
Physical & Chemical Properties
| Molecular Formula | C21H31O2P2S Cl |
| Molecular Weight | 444.94 g/mol |
| Purity | 97%+ |
| Storage | Store at room temperature, protect from light |
| Solubility (reference) | Soluble in chloroform, dichloromethane, ethyl acetate, DMSO |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light; Contains ester bond; hydrolyzes under strong alkaline conditions |
| Degree of Unsaturation (DBE) | 6.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1957 |
| Halogen Content | Cl-containing |
| Sulfur Atoms | 1 |
Related o Standards
- 3-(M-Tolyl)isonicotinic acid (CAS 100004-79-3)
- 2-(m-Tolyl)isonicotinic acid (CAS 100004-94-2)
- 4-(P-tolyl)benzo[b]thiophene-6-carboxylic acid (CAS 100046-86-4)
- 2-((1-(P-tolyl)-3-(trifluoromethyl)-1h-pyrazol-5-yl)oxy)acetohydrazide (CAS 1002034-07-2)
- 1-(O-tolyl)cyclopentan-1-ol (CAS 100256-17-5)
- 5-(p-Tolyl)isoxazole-4-carbonyl chloride (CAS 1003562-04-6)
- 4-(m-Tolyl)-1-tosyl-1H-pyrazol-5-amine (CAS 1003992-23-1)
- 4-(o-Tolyl)-1-tosyl-1H-pyrazol-5-amine (CAS 1003992-24-2)
Recommended Standards
- 2-(5-Chlorothiophen-2-yl)-N-(thiazol-2-yl)acetamide (CAS 921545-76-8)
- Methyl 3-Hydroxy-2-nitrobenzoate (CAS 89942-77-8)
- N-({1'-benzyl-4',5'-dimethyl-1'H-[1,2'-bipyrrole]-3'-yl}methyl)-3-methoxybenzamide (CAS 478077-08-6)
- Hippocampal Cholinergic Neurostimulating Peptide (CAS 140158-49-2)
- 2-(2,2-Difluoro-2H-1,3-benzodioxol-4-yl)acetonitrile (CAS 157437-24-6)
- 3,5-Diethyl 6-({[(4-chlorophenyl)carbamoyl]amino}amino)-2-oxo-1,2-dihydropyridine-3,5-dicarboxylate (CAS 321432-00-2)
- Cefotiam Impurity 39 (CAS CATO-C4X-120439)
- 5-Methoxy-1-methyl-1H-pyrazol-4-amine (CAS 1393100-53-2)
- (E)-Ethyl 3-acetamidobut-2-enoate (CAS 23652-67-7)
- Peptide Impurity 15 (CAS 1227750-69-7)
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