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214701

Sigma-Aldrich

Phosphorus pentoxide

ReagentPlus®, 99%

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

vapor density

4.9 (vs air)

Quality Level

vapor pressure

1 mmHg ( 384 °C)
10 mmHg ( 238 °C)

product line

ReagentPlus®

assay

99%

form

powder

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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Phosphorus pentoxide ReagentPlus®, 99%

214701

Phosphorus pentoxide

Phosphorus pentoxide puriss. p.a., ACS reagent, ≥98.0% (T)

79609

Phosphorus pentoxide

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

902160

Phosphorus pentoxide

Phosphorus pentoxide ≥99.99% trace metals basis

431419

Phosphorus pentoxide

assay

99%

assay

≥98.0% (T)

assay

99%

assay

≥99.99% trace metals basis

Quality Level

100

Quality Level

200

Quality Level

-

Quality Level

100

cation traces

As: ≤100 mg/kg, heavy metals (as Pb): ≤0.02%, Fe: ≤100 mg/kg

cation traces

As: ≤100 mg/kg, Ca: ≤10 mg/kg, Cd: ≤5 mg/kg, Co: ≤5 mg/kg, Cr: ≤5 mg/kg, Cu: ≤5 mg/kg, Fe: ≤5 mg/kg, K: ≤50 mg/kg, Mg: ≤5 mg/kg, Mn: ≤5 mg/kg, NH4+: ≤10 mg/kg, Na: ≤50 mg/kg, Ni: ≤5 mg/kg, Pb: ≤5 mg/kg, Zn: ≤5 mg/kg

cation traces

As: ≤100 mg/kg, Fe: ≤100 mg/kg, heavy metals (as Pb): ≤0.02%

cation traces

NH4+: ≤0.01%, heavy metals: ≤0.01%

vapor pressure

1 mmHg ( 384 °C), 10 mmHg ( 238 °C)

vapor pressure

1 mmHg ( 384 °C), 10 mmHg ( 238 °C)

vapor pressure

1 mmHg ( 384 °C), 10 mmHg ( 238 °C)

vapor pressure

1 mmHg ( 384 °C), 10 mmHg ( 238 °C)

mp

340 °C (lit.)

mp

340 °C (lit.)

mp

340 °C (lit.)

mp

340 °C (lit.)

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

pictograms

Corrosion

signalword

Danger

hcodes

Hazard Classifications

Eye Dam. 1 - Skin Corr. 1A

supp_hazards

Storage Class

8B - Non-combustible, corrosive hazardous materials

wgk_germany

WGK 1

flash_point_f

Not applicable

flash_point_c

Not applicable

ppe

Eyeshields, Faceshields, Gloves, type P3 (EN 143) respirator cartridges


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Synthesis of poly (benzoxazole) s by direct polycondensation of dicarboxylic acids with 3, 3??dihydroxybenzidine dihydrochloride using phosphorus pentoxide/methanesulfonic acid as condensing agent and solvent.
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Journal of Polymer Science Part A: Polymer Chemistry, 24(5), 1019-1026 (1986)
Kinetics of melting and crystallization of phosphorus pentoxide.
Cormia RL, et al.
Journal of Applied Physics, 34(8), 2239-2244 (1963)

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