215112

Phosphorous acid

99%

• Synonym(s): Phosphonic acid
• Empirical Formula (Hill Notation): H₃O₃P
• CAS Number: 13598-36-2
• Molecular Weight: 82.00
• EC Number: 237-066-7
• MDL number: MFCD00137258
• UNSPSC Code: 12352106
• PubChem Substance ID: 329752161
• NACRES: NA.21

Properties

• Quality Level: 100
• Assay: 99%
• form: crystals or chunks; flakes
• solubility: water: soluble
• density: 1.651 g/mL at 25 °C (lit.)
• SMILES string: [H]P(O)(O)=O
• InChI: 1S/H3O3P/c1-4(2)3/h4H,(H2,1,2,3)
• InChI key: ABLZXFCXXLZCGV-UHFFFAOYSA-N

Description

General description

Phosphorous acid (or phosphonic acid) is a phosphorus oxoacid commonly used as an intermediate in chemical synthesis for the production of various phosphorus compounds. It is also used as a strong reducing agent in organic synthesis.

Application

Phosphorous acid (H₃PO₃, orthophosphorous acid) may be used as one of the reaction components for the synthesis of the following:

• α-aminomethylphosphonic acids via Mannich-Type Multicomponent Reaction
• 1-aminoalkanephosphonic acids via amidoalkylation followed by hydrolysis
• N-protected α-aminophosphonic acids (phospho-isosteres of natural amino acids) via amidoalkylation reaction

Safety Information

• Pictograms: GHS05,GHS07
• Signal Word: Danger
• Hazard Statements: H290,H302,H314
• Precautionary Statements: P260 - P280 - P301 + P312 + P330 - P301 + P330 + P331 - P303 + P361 + P353 - P305 + P351 + P338 + P310
• Hazard Classifications: Acute Tox. 4 Oral - Eye Dam. 1 - Met. Corr. 1 - Skin Corr. 1A
• Storage Class Code: 8A - Combustible corrosive hazardous materials
• WGK: WGK 1
• Flash Point(F): Not applicable
• Flash Point(C): Not applicable