| Identification | Back Directory | [Name]
METHYLPHOSPHONIC ACID | [CAS]
993-13-5 | [Synonyms]
NSC 119358
METHYLPHOSPHONIC ACID
METHANEPHOSPHONIC ACID
Methylphosphonicacid,98%
Phosphonic acid, methyl-
Methanephosphonic acid,98%
Methylphosphonic acid ,97.5%
Methanephosphonic acid, 98% 5GR
Methanephosphonic acid, 98% 25GR
Methylphosphonic acid solution
| [EINECS(EC#)]
237-027-4 | [Molecular Formula]
CH5O3P | [MDL Number]
MFCD00002137 | [MOL File]
993-13-5.mol | [Molecular Weight]
96.02 |
| Chemical Properties | Back Directory | [Appearance]
white crystals or flakes | [Melting point ]
105-107 °C(lit.)
| [Boiling point ]
265.2±23.0 °C(Predicted) | [density ]
1.495±0.06 g/cm3(Predicted) | [vapor pressure ]
0Pa at 20℃ | [storage temp. ]
?20°C | [solubility ]
H2O: soluble2.88 g in 30 mL, clear, colorless | [form ]
Crystalline Powder | [pka]
pK1:2.38;pK2:7.74 (25°C) | [color ]
White to off-white | [PH]
0.9-1.4 | [Stability:]
Stable. Incompatible with strong oxidizing agents, strong bases. | [Water Solubility ]
Soluble in water and alcohol. | [Sensitive ]
Hygroscopic | [λmax]
λ: 260 nm Amax: ≤0.05
λ: 280 nm Amax: ≤0.04 | [BRN ]
1739372 | [LogP]
-1.556 at 20℃ | [Uses]
Organic synthesis. | [EPA Substance Registry System]
Phosphonic acid, P-methyl- (993-13-5) |
| Questions And Answer | Back Directory | [Preparation]
In the preparation of methylphosphonic acid, triethyl phosphite is first subjected to the Michel-Albuzov reaction to generate a pentavalent phosphorus center: CH3Cl + P(OC2H5)3 → CH3PO(OC2H5)2 + C2H5Cl The resulting dialkylphosphonate reacts with trimethylchlorosilane, and then the siloxophosphonate is hydrolyzed to produce the desired product. CH3PO(OC2H5)2 + 2 Me3SiCl → CH3PO(OSiMe3)2 + 2 C2H5Cl CH3PO(OSiMe3)2 + 2H2O → CH3PO(OH)2 + 2 HOSiMe3 |
| Hazard Information | Back Directory | [Chemical Properties]
white crystals or flakes | [Application]
Methylphosphonic acid is used in the production of lubricant additives and for treating textiles.
| [Definition]
ChEBI: Methylphosphonic acid is a one-carbon compound that is phosphonic acid in which the hydrogen attached to the phosphorus is substituted by a methyl group. It is a one-carbon compound and a member of phosphonic acids. It is functionally related to a phosphonic acid. It is a conjugate acid of a methylphosphonate(1-). | [Flammability and Explosibility]
Notclassified | [Purification Methods]
Methylphosphonic acid [993-13-5] M 96.0, m 104-106o, 105-107o, 108o, pK 1 2.12, pK 2 7.29. If it tests for Cl-, then add H2O and evaporate to dryness, repeat several times till free from Cl-. The residue solidifies to a wax-like solid. Alternatively, dissolve the acid in the minimum volume of H2O, add charcoal, warm, filter and evaporate to dryness in a vacuum over P2O5. [Kosolapoff J Am Chem Soc 75 3379 1953.] The di-Na salt is prepared from 24g of acid in 50mL of dry EtOH, and a solution of 23g Na dissolved in 400mL EtOH is added. A white precipitate is formed, but the mixture is refluxed for 30minutes to complete the reaction. Filter off the solid and recrystallise it from 50% EtOH. Dry the crystals in a vacuum desiccator. [Thompson J Chem Soc 3292 1952, Beilstein 4 IV 3498.] |
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J & K SCIENTIFIC LTD.
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18210857532 18210857532 |
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https://www.jkchemical.com |
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Alfa Aesar
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400-6106006 |
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http://chemicals.thermofisher.cn |
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Energy Chemical
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400-0056266 |
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www.energy-chemical.com |
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