METHYLPHOSPHONIC ACID Chemical Properties

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

Water Solubility 

Soluble in water and alcohol.

Sensitive 

Hygroscopic

λmax

λ: 260 nm Amax: ≤0.05
λ: 280 nm Amax: ≤0.04

BRN 

1739372

Stability:

Stable. Incompatible with strong oxidizing agents, strong bases.

LogP

-1.556 at 20℃

EPA Substance Registry System

Phosphonic acid, P-methyl- (993-13-5)

Safety Information

Hazard Codes 

C,T,F

Risk Statements 

22-34-39/23/24/25-23/24/25-11

Safety Statements 

26-36/37/39-45-36/37-16-7

RIDADR 

UN 3261 8/PG 2

WGK Germany 

3

F 

10

HazardClass 

8

PackingGroup 

II

HS Code 

29310099

Hazardous Substances Data

993-13-5(Hazardous Substances Data)

MSDS

• Language:English Provider:ACROS
• Language:English Provider:SigmaAldrich
• Language:English Provider:ALFA

METHYLPHOSPHONIC ACID Usage And Synthesis

Chemical Properties

white crystals or flakes

Uses

Organic synthesis.

Uses

Methylphosphonic acid is used to produce methyl-phosphonic acid dichloride by chlorination.

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-).

Application

Methylphosphonic acid is used in the production of lubricant additives and for treating textiles.

Flammability and Explosibility

Not classified

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.]

METHYLPHOSPHONIC ACID(993-13-5)Related Product Information

• Amino tris(methylene phosphonic acid)
• diethyl benzylphosphonate
• DIETHYL 2-BROMOETHYLPHOSPHONATE
• Methyl diethylphosphonoacetate
• Ethyl diethoxyphosphinylformate
• TRIETHYL PHOSPHONOACETATE
• ETHYLPHOSPHONIC ACID
• METHYLENEDIPHOSPHONIC ACID
• Phenylphosphonic acid
• 3-Aminopropylphosphonic acid
• Diethyl cyanomethylphosphonate
• (Aminomethyl)phosphonic acid
• TRIETHYL 4-PHOSPHONOCROTONATE
• PHOSPHONOACETIC ACID
• TRIMETHYLSILYL DIETHYLPHOSPHONOACETATE
• Trimethyl phosphonoacetate
• DIETHYL 4-AMINOBENZYLPHOSPHONATE
• TRIETHYL 2-PHOSPHONOPROPIONATE