Phosphorus Pentoxide - P2O5 (P4O10) - CAS# 1314-56-3

Phosphorus Pentoxide - P2O5 (P4O10) - CAS# 1314-56-3

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Phosphorus pentoxide is a deliquescent compound prepared by reacting phosphorus with air. It is a commonly used as dehydrating and condensing agent in organic synthesis.


Name: Phosphorus Pentoxide
Other Names: Phosphorus (V) Oxide, Diphosphorus pentoxide, Phosphoric anhydride Formula: P4O10 (Empirical: P2O5)
CAS# 1314-56-3 / 16752-60-6
Molar mass: 283.9 g mol−1
Appearance: white powder, very deliquescent, odorless
SG: 2.39 g/cm3
MP: 340 °C (644 °F; 613 K)
BP: 360 °C (sublimes)
Solubility (H2O, 20°C): exothermic hydrolysis
Vapor pressure: 1 mmHg @ 385 °C (stable form)
Grade: Laboratory grade
Purity: >98% purity


Dehydrating agent used for halogenation with tetrabutylammonium halides. Process for Producing Halogenated Heteroaryl Compounds Phosphorus pentachloride has been used for the vaccum distillation of 1-methyl-2-pyrrolidinone (NMP), which was employed as mobile phase in a chromatographic analysis. It may be used as one of the reaction components in the synthesis of dichlorine heptoxide (Cl2O7) and transition-metal phosphides (Ni2P, Co2P and MoP). P2O5/KX (X = Br, I) reagent system may be used for the transformation of alcohols into the corresponding alkyl iodides and bromides. Phosphorus pentoxide/methanesulfonic acid (PPMA) may be used as a condensing agent and solvent for the synthesis of:

  • High molecular weight poly(benzoxazole)s via direct polycondensation of aromatic dicarboxylic acids containing phenyl ether structure with 3,3′-dihydroxybenzidine dihydrochloride.
  • Aromatic poly(phenylene ether ether ketone)s via direct self-polycondensation of 4-(4′-phenoxyphenoxy)benzoic acids.
  • 1,3-1H-dibenzimidazole-benzene by the reaction of isophthalic acid with 1,2-diaminobenzene.


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