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902160

Sigma-Aldrich

Phosphorus pentoxide

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

Synonym(s):

Phosphoric anhydride, Phosphorus(V) oxide

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About This Item

Linear Formula:
P2O5
CAS Number:
1314-56-3
Molecular Weight:
141.94
UNSPSC Code:
12352303
PubChem Substance ID:
24852847
NACRES:
NA.21

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

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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 Merck KGaA, Darmstadt, Germany
Redi-Dri is a trademark of Sigma-Aldrich Co. LLC

pictograms

Corrosion
GHS05

signalword

Danger

hcodes

H314

Hazard Classifications

Eye Dam. 1 - Skin Corr. 1A

supp_hazards

EUH014

Storage Class

8B - Non-combustible corrosive hazardous materials

wgk_germany

WGK 1

flash_point_f

Not applicable

flash_point_c

Not applicable

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Certificates of Analysis (COA)

Lot/Batch Number
MKCF7546

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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)
Kinetics of melting and crystallization of phosphorus pentoxide.
Cormia RL, et al.
Journal of Applied Physics, 34(8), 2239-2244 (1963)
Synthesis of aromatic poly (ether ketone) s in phosphorus pentoxide/methanesulfonic acid.
Ueda M and Oda M.
Polymer Journal, 21(9), 673-679 (1989)
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)
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)
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