298220

Phosphorpentoxid

powder, ACS reagent, ≥98.0%

• Synonym(e): Phosphor(V)-oxid, Phosphorsäure-anhydrid
• Lineare Formel: P₂O₅
• CAS-Nummer: 1314-56-3
• Molekulargewicht: 141.94
• EG-Nummer: 215-236-1
• UNSPSC-Code: 12352303
• PubChem Substanz-ID: 24857969
• NACRES: NA.21

Eigenschaften

• Qualität: ACS reagent
• Qualitätsniveau: 200
• Dampfdichte: 4.9 (vs air)
• Dampfdruck: 1 mmHg ( 384 °C); 10 mmHg ( 238 °C)
• Assay: ≥98.0%
• Form: powder
• Verunreinigungen: P₂O₃, passes test (lim. ~0.02%); ≤0.02% insolubles
• pH-Wert: 1.5 (20 °C, 10 g/L)
• mp (Schmelzpunkt): 340 °C (lit.)
• Dichte: 2.3 g/mL at 25 °C (lit.)
• Kationenspuren: 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
• InChIKey: YWEUIGNSBFLMFL-UHFFFAOYSA-N

Beschreibung

Allgemeine Beschreibung

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

Anwendung

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.

Sicherheitshinweise

• Piktogramme: GHS05
• Signalwort: Danger
• H-Sätze: H314
• P-Sätze: P260 - P280 - P303 + P361 + P353 - P304 + P340 + P310 - P305 + P351 + P338 - P363
• Gefahreneinstufungen: Eye Dam. 1 - Skin Corr. 1A
• Zusätzliche Gefahrenhinweise: EUH014
• Lagerklassenschlüssel: 8B - Non-combustible corrosive hazardous materials
• WGK: WGK 1
• Flammpunkt (°F): Not applicable
• Flammpunkt (°C): Not applicable
• Persönliche Schutzausrüstung: Eyeshields, Faceshields, Gloves, type P3 (EN 143) respirator cartridges