298220

Sigma-Aldrich

Phosphorus pentoxide

powder, ACS reagent, ≥98.0%

Synonym(s):
Phosphoric anhydride, Phosphorus(V) oxide
Linear Formula:
P2O5
CAS Number:
Molecular Weight:
141.94
EC Number:
PubChem Substance ID:
NACRES:
NA.21

Quality Level

grade

ACS reagent

vapor density

4.9 (vs air)

vapor pressure

1 mmHg ( 384 °C)
10 mmHg ( 238 °C)

assay

≥98.0%

form

powder

impurities

P2O3, passes test (lim. ~0.02%)
≤0.02% insolubles

pH

1.5 (20 °C, 10 g/L)

mp

340 °C (lit.)

density

2.3 g/mL at 25 °C (lit.)

cation traces

NH4+: ≤0.01%
heavy metals (as Pb): ≤0.01%

SMILES string

O=P12OP3(=O)OP(=O)(O1)OP(=O)(O2)O3

InChI

1S/O10P4/c1-11-5-12(2)8-13(3,6-11)10-14(4,7-11)9-12

InChI key

YWEUIGNSBFLMFL-UHFFFAOYSA-N

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General description

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

Application

Phosphorus pentoxide may be used for the vacuum 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 supported on alumina can be used for the solvent-free and microwave-assisted preparation of 1, 5-benzodiazepine analogs. 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.P8}
  • 1,3-1H-dibenzimidazole-benzene by the reaction of isophthalic acid with 1,2-diaminobenzene.

Packaging

250, 500, 6×500 g in poly bottle
5 g in glass bottle

Pictograms

Corrosion

Signal Word

Danger

Hazard Statements

hazcat

Eye Dam. 1 - Skin Corr. 1A

Supp Hazards

EUH014

storage_class_code

8A - Combustible, corrosive hazardous materials

WGK Germany

WGK 1

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Personal Protective Equipment

dust mask type N95 (US),Eyeshields,Gloves

Certificate of Analysis

Certificate of Origin

The Merck Index: An Encyclopedia of Chemicals, Drugs, and Biologicals
Royal Society of Chemistry null
Kinetics of melting and crystallization of phosphorus pentoxide.
Cormia RL, et al.
Journal of Applied Physics, 34(8), 2239-2244 (1963)
An efficient and selective method for the iodination and bromination of alcohols under mild conditions.
Khazdooz L, et al.
Tetrahedron Letters, 57(2), 168-171 (2016)
Sulfonated polysulfone with 1, 3-1H-dibenzimidazole-benzene additive as a membrane for direct methanol fuel cells.
Fu Y, et al.
Journal of Membrane Science, 310(1), 262-267 (2008)
Mechanical mixtures of metal oxides and phosphorus pentoxide as novel precursors for the synthesis of transition-metal phosphides.
Guo L, et al.
Dalton Transactions, 45(3), 1225-1232 (2016)

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