Date published: 2026-4-5

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Diphenyl phosphite (CAS 4712-55-4)

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Alternate Names:
Diphenyl phosphonate
CAS Number:
4712-55-4
Molecular Weight:
234.19
Molecular Formula:
C12H11O3P
For Research Use Only. Not Intended for Diagnostic or Therapeutic Use.
* Refer to Certificate of Analysis for lot specific data.

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Diphenyl phosphite functions as a stabilizer and antioxidant in polymerization processes. It acts as a phosphorus-based flame retardant, inhibiting the degradation of polymers by scavenging free radicals and preventing chain scission. Diphenyl Phosphite′s mechanism of action involves the formation of stable phosphorus-containing intermediates, which interrupt the radical chain reaction and reduce the formation of volatile degradation products. By effectively trapping and neutralizing free radicals, diphenyl phosphite helps to maintain the molecular weight and mechanical properties of polymers during processing and storage. Its presence in polymer formulations contributes to the enhancement of thermal stability and the reduction of discoloration and degradation caused by exposure to heat and light. In this way, diphenyl phosphite plays a functional role in the preservation and performance of polymer materials, supporting the development of durable and high-quality products.


Diphenyl phosphite (CAS 4712-55-4) References

  1. Synthesis of sterically hindered peptide analogs using diphenyl phosphite as the coupling reagent.  |  Yang, T., et al. 2005. Bioorg Chem. 33: 386-92. PMID: 16005935
  2. 3'-H-phosphonate synthesis of chiral benzo[a]pyrene diol epoxide adducts at N(2) of deoxyguanosine in oligonucleotides.  |  Iyer, PC., et al. 2007. Chem Res Toxicol. 20: 311-5. PMID: 17305411
  3. Enantioselective 1,4-addition reactions of diphenyl phosphite to nitroalkenes catalyzed by an axially chiral guanidine.  |  Terada, M., et al. 2007. J Am Chem Soc. 129: 14112-3. PMID: 17960904
  4. Synthesis of amino acid phosphoramidate monoesters via H-phosphonate intermediates.  |  Choy, CJ., et al. 2006. Curr Protoc Nucleic Acid Chem. Chapter 15: Unit 15.1. PMID: 18428952
  5. Enantioselective three-component Kabachnik-Fields reaction catalyzed by chiral scandium(III)-N,N'-dioxide complexes.  |  Zhou, X., et al. 2009. Org Lett. 11: 1401-4. PMID: 19226133
  6. Squaramide-catalyzed enantioselective Michael addition of diphenyl phosphite to nitroalkenes.  |  Zhu, Y., et al. 2010. Angew Chem Int Ed Engl. 49: 153-6. PMID: 19950156
  7. Thiourea catalyzed organocatalytic enantioselective Michael addition of diphenyl phosphite to nitroalkenes.  |  Alcaine, A., et al. 2011. Org Biomol Chem. 9: 2777-83. PMID: 21350778
  8. Quinidine thiourea-catalyzed enantioselective synthesis of β-nitrophosphonates: Beneficial effects of molecular sieves.  |  Abbaraju, S., et al. 2011. Tetrahedron. 67: 7479-7484. PMID: 21921970
  9. A novel ketone olefination via organozinc reagents in the presence of diphenyl phosphite.  |  Cui, H., et al. 2012. Org Biomol Chem. 10: 2862-9. PMID: 22388950
  10. First example of quinine-squaramide catalyzed enantioselective addition of diphenyl phosphite to ketimines derived from isatins.  |  George, J., et al. 2014. Org Biomol Chem. 12: 1595-602. PMID: 24469542
  11. P,S Ligands for the Asymmetric Construction of Quaternary Stereocenters in Palladium-Catalyzed Decarboxylative [4+2] Cycloadditions.  |  Wei, Y., et al. 2016. Angew Chem Int Ed Engl. 55: 2200-4. PMID: 26836347
  12. Influence of Phosphorus Structures and Their Oxidation States on Flame-Retardant Properties of Polyhydroxyurethanes.  |  Denis, M., et al. 2023. Molecules. 28: PMID: 36677667
  13. BF3-Et2O Promoted Heteronucleophilic Addition Reactions for the Synthesis of Unsymmetrical gem-Diarylmethyl Thioethers.  |  Ahmed, S., et al. 2023. Org Lett. 25: 5017-5021. PMID: 37387457

Ordering Information

Product NameCatalog #UNITPriceQtyFAVORITES

Diphenyl phosphite, 100 g

sc-484711
100 g
$32.00