Triphenylphosphine Oxide is an organophosphorus compound commonly obtained as an oxidation product or reaction byproduct in organophosphorus synthesis, and it is also used as a defined phosphine oxide intermediate in downstream chemical processes. Its structure features a pentavalent phosphorus–oxygen bond, providing chemical stability and predictable coordination behavior, which supports its role in controlled transformation or recovery pathways within industrial synthesis systems. In chemical manufacturing and fine chemical processing, Triphenylphosphine Oxide is typically applied in organophosphorus synthesis routes where phosphorus-containing intermediates or recovered materials are required. For industrial sourcing, the material is available with competitive factory pricing, customized specifications, and complete documentation including MSDS, TDS, COA, supplied for bulk supply.
Triphenylphosphine Oxide CAS 791-28-6
- CAS: 791-28-6
- Einecs: 212-338-8
- Molecular Formula: C₁₈H₁₅OP
- Grade: Industrial grade 99%
- Package: 200kg iron drum or 50kg plastic drum packing
Product Description
| Product Name: | Triphenylphosphine oxide |
| Alias: | triphenylophosphosphine; triphenylphosphine oxide; triphenylphosphine oxide |
| Cas No.： | 791-28-6 |
| Molecular formula: | C18H15OP |
| Molecular weight: | 278.28 |
Physical and chemical properties
Appearance and properties: white crystalline powder
Density: 1.212g/cm³ Melting point: 154-158 °C
Boiling point: 360 °C Flash point: 180 °C
Vapor pressure: 2.62E-08mmHg at 25°C
Main uses: It can be used as an organic synthesis intermediate, pharmaceutical intermediate, catalyst and extractant.
Related properties The rigidity of the triphenylphosphine oxide backbone and the alkalinity of oxygen atoms make it possible to induce the crystallization of compounds that are difficult to crystallize by other methods, especially for substances containing acidic hydrogen, such as phenols.
Redox
Many metal ions can catalyze the oxidation of PPh3 to Ph3PO, which occurs as follows: 2 PPh3 + O2 → 2 Ph3PO Therefore, triphenylphosphine samples often contain the impurity triphenyloxyphosphine.
Oxidized triphenylphosphine can be regenerated by reacting with trichlorosilane: Ph3PO + SiHCl3 → PPh3 + 1/n (OSiCl2)n + HCl
Storage Precautions
Store in a cool, ventilated warehouse;
Stay away from fire and heat sources;
Package sealing;
equipped with corresponding varieties and quantities of fire-fighting equipment;
The storage area should be equipped with appropriate materials to contain the spill.
FAQ - Technical & Supply Chain
-
Q:
How is Triphenylphosphine Oxide confirmed to match CAS 791-28-6 in industrial documentation?
A: Identification is based on alignment of the CAS number with the triphenyl-substituted phosphine oxide structure, supported by standard analytical data and consistency across SDS and COA records. -
Q:
In industrial processes, is Triphenylphosphine Oxide mainly used as a reagent or as a recovered intermediate?
A: It is most commonly encountered and applied as a recovered or isolated intermediate in organophosphorus synthesis routes, rather than as a primary activating reagent.
Documents and Product Support
For product review and sourcing evaluation, supporting documents can be coordinated according to the product type, inquiry stage, and order requirements.
- COA for batch-based quality reference
- TDS for key physical and chemical information
- SDS / MSDS for handling, storage, and safety reference
- Packing information for sample, trial, and bulk orders
- Technical communication based on application and specification requirements
Information to Confirm Before Quotation
Clear sourcing information helps reduce specification mismatch and allows a more accurate quotation before sample or bulk order discussion.
- Product name and CAS number
- Application or intended end use
- Required purity, grade, or specification
- Sample quantity, trial order, or bulk demand
- Preferred packing form or net weight
- Destination country or port
- Required documents or compliance expectations
Packaging, Storage, and Handling Notes
Packaging form, storage conditions, shelf life, and shipment arrangements should be confirmed according to the product characteristics, package size, and destination requirements.
Before order confirmation, buyers are advised to review the corresponding product documents and confirm whether any special storage, labeling, or handling requirements apply.
Sample, Bulk Order and Repeat Supply Support
Support can be arranged for sample discussion, bulk supply planning, packaging confirmation, and routine sourcing communication based on the actual product and order requirements.
For repeat-use formulations or long-term procurement plans, buyers may discuss specification consistency, packaging preferences, delivery expectations, and document coordination in advance.
