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902160 Sigma-Aldrich

Phosphorus pentoxide

anhydrous, free-flowing, Redi-Dri, ReagentPlus®, 99%

Synonym: Phosphoric anhydride, Phosphorus(V) oxide

  • CAS Number 1314-56-3

  • Linear Formula P2O5

  • Molecular Weight 141.94

  •  PubChem Substance ID 24852847

  •  NACRES NA.21

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Properties

grade   anhydrous
vapor density   4.9 (vs air)
vapor pressure   1 mmHg ( 384 °C)
  10 mmHg ( 238 °C)
product line   ReagentPlus®
  Redi-Dri
assay   99%
form   powder
quality   free-flowing
pH   1.5 (20 °C, 10 g/L)
mp   340 °C (lit.)
density   2.3 g/mL at 25 °C (lit.)
cation traces   As: ≤100 mg/kg
  Fe: ≤ 100 mg/kg
  heavy metals (as Pb): ≤ 0.02%
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

Description

General description

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.

Application

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 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.
• 1,3-1H-dibenzimidazole-benzene by the reaction of isophthalic acid with 1,2-diaminobenzene.

Legal Information

ReagentPlus is a registered trademark of Sigma-Aldrich Co. LLC

Redi-Dri is a trademark of Sigma-Aldrich Co. LLC

Safety & Documentation

Safety Information

Symbol 
GHS05  GHS05
Signal word 
Danger
Hazard statements 
Supplemental Hazard Statements 
EUH014
RIDADR 
UN 1807 8 / PGII
WGK Germany 
WGK 1
Flash Point(F) 
Not applicable
Flash Point(C) 
Not applicable

Documents

Certificate of Analysis (COA)

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Protocols & Articles
Peer-Reviewed Papers
15

References

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