Tris(4-methylphenyl)phosphine Oxide CAS 797-70-6
| CAS No. | 797-70-6 |
| Molecular Formula | C21H21OP |
| Molecular Weight | 320.36 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Tris(4-methylphenyl)phosphine Oxide (CAS 797-70-6), molecular formula C21H21OP and molecular weight 320.36 g/mol, is a CATO reference standard with documented purity and traceability.
Owing to a steroid core, organophosphorus functionality, a hydroxyl group, an ether linkage, Tris(4-methylphenyl)phosphine Oxide is typically pale yellow to yellow crystalline powder. Its solid-state physicochemical attributes — including a molecular weight of 320.36 g/mol — guide the selection of appropriate sample preparation and analytical techniques. The aromatic system may exhibit native fluorescence, enabling detection with a fluorescence detector (FLD).
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.
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 | C21H21OP |
| Molecular Weight | 320.36 g/mol |
| Appearance | Pale yellow to yellow crystalline powder |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light |
| Solubility (reference) | Soluble in chloroform, dichloromethane, ethyl acetate, DMSO |
| Stability | Light-sensitive; avoid direct strong light |
| Degree of Unsaturation (DBE) | 11.5 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1957 |
Related Tris Standards
- 4-(4-Methylphenyl)-2-{[2-(morpholin-4-yl)ethyl]amino}-4-oxobutanoic acid (CAS 1023947-01-4)
- 4-(4-Methylphenyl)-2-(methylsulfanyl)-1,4-dihydro-5H-indeno[1,2-d]pyrimidin-5-one (CAS 691873-08-2)
- 1-(4-Methylphenyl)-4-phenyl-3-[(pyrrolidin-1-yl)methyl]azetidin-2-one (CAS 551921-49-4)
- Ethyl 4-[(4-methylphenyl)sulfanyl]-2-(methylsulfanyl)pyrimidine-5-carboxylate (CAS 339019-51-1)
- (3R)-1-[(4-Methylphenyl)sulfonyl]tetrahydro-1H-pyrrol-3-yl methanesulfonate (CAS 956187-93-2)
- Ethyl 2-({[4-(4-methylphenyl)-1,3-thiazol-2-yl]carbamoyl}amino)acetate (CAS 1330750-54-3)
- 3-[N-(4-methylphenyl)benzenesulfonamido]propanoic acid (CAS 565165-50-6)
- 4-{[(3-Methylphenyl)(methylsulfonyl)amino]methyl}benzoic acid (CAS 353502-15-5)
Recommended Standards
- Tribenzylphosphine oxide (CAS 4538-55-0)
- 2-Amino-5-(4-methoxyphenylcarbamoyl)-4-methyl thiophene-3-carboxylic acid methyl ester 2-amino-5-(4-methoxy-phenylcarbamoyl)-4-methyl-thiophene-3-carboxylic acid methyl ester 2-amino-5-(4-methoxyphenylcarbamoyl)-4-methylthiophene-3-carboxylic acid methyl ester 350996-96-2 methyl 2-amino-5-([(4-methoxyphenyl)amino]-carbonyl)-4-methylthiophene-3-carboxylate (CAS 350996-96-2)
- tert-Butyl 5-fluoro-2-oxospiro[indoline-3,4-piperidine]-1-carboxylate (CAS 866028-06-0)
- Palbociclib Impurity 69 (CAS 6163-63-9)
- 5-Chloro-1-(3-chlorobenzyl)-6-oxo-1,6-dihydropyridine-3-carboxylic acid (CAS 339024-74-7)
- 2-(4-(2-Amino-3-cyano-5-oxo-5,6,7,8-tetrahydro-4H-chromen-4-yl)-2-methoxyphenoxy)-N-(3-nitrophenyl)acetamide (CAS 333778-09-9)
- 3-[(4-Bromo-2-propylphenoxy)methyl]piperidinehydrochloride (CAS 1220032-67-6)
- 5-Chloro-1,1,1-trifluoropentane (CAS 352-59-0)
- 2-Methyloctahydro-1H-5,8-methanopyrrolo[1,2-a]azepine (CAS 90307-30-5)
- 5-Chloro-3,3'-bipyridine (CAS 284040-67-1)
- 4-(2,5-Diphenyl-1h-pyrrol-1-yl)phenol (CAS 853-38-3)
- (S)-Methyl prolylglycinate (CAS 33256-35-8)
- 1-Benzyl-N-(4-chlorophenyl)-2,6-dioxo-1,2,3,6-tetrahydropyrimidine-4-carboxamide (CAS 338412-47-8)
- His-Cyclic-Semaglutide (CAS CATO-C4X-2226182)
Why CATO?
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