Phenylphosphonic acid Chemical Properties

Melting point:

162-164 °C (lit.)

Boiling point:

241-243 °C(lit.)

Density 

1.412 g/mL at 25 °C(lit.)

vapor pressure 

0-0Pa at 20-25℃

refractive index 

n20/D 1.523(lit.)

Flash point:

>230 °F

storage temp. 

Sealed in dry,Room Temperature

form 

Crystalline Powder

pka

pK1:1.83;pK2:7.07 (25°C)

color 

White to off-white

Water Solubility 

40.4 g/100 mL (25 ºC)

BRN 

2245168

LogP

-3.3-0.086 at 20-25℃ and pH4-7

Surface tension

71.2mN/m at 1g/L and 20℃

CAS DataBase Reference

1571-33-1(CAS DataBase Reference)

EPA Substance Registry System

Phosphonic acid, phenyl- (1571-33-1)

Safety Information

Hazard Codes 

C,Xn

Risk Statements 

34-37-41-37/38-22-38

Safety Statements 

26-39-37/39-45-36/37/39

RIDADR 

UN 3265 8/PG 2

WGK Germany 

3

RTECS 

TD4393000

F 

10

TSCA 

Yes

HazardClass 

8

PackingGroup 

III

HS Code 

29319090

Toxicity

mouse,LD50,intraperitoneal,110mg/kg (110mg/kg),"Summary Tables of Biological Tests," National Research Council Chemical-Biological Coordination Center. Vol. 2, Pg. 55, 1950.

MSDS

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

Phenylphosphonic acid Usage And Synthesis

Chemical Properties

white to off-white crystalline powder

Uses

Intermediate in antifouling paint agents; catalyst in organic reactions.

Uses

Phenylphosphonic acid additive used with Noyori's catalyst for oxidation of sulfides to sulfones. Used as additive of unsaturated polyester PU resin. It also can be added into nylon to improve its polymerization degree. It can be used as extreme pressure agent of lube; used as catalyst of carboxylic acid & alcohol reaction; it can be used as fire retarding treatment of fiber used asganic materials.

Definition

ChEBI: Phenylphosphonic acid is a member of benzenes.

Hazard

Highly toxic.

Purification Methods

It is best to recrystallise it from H2O by concentrating an aqueous solution to a small volume and allowing to crystallise. Wash the crystals with ice cold H2O and dry them in a vacuum desiccator over H2SO4. [Lecher et al. J Am Chem Soc 76 1045 1954.] pK2 5 values in H2O are 7.07, and in 50% EtOH 8.26. [Jaffé et al. J Am Chem Soc 75 2209 1953, IR: Daasch & Smith Anal Chem 23 853 1951, Beilstein 16 IV 1068.]

Phenylphosphonic acid(1571-33-1)Related Product Information

• Folic acid
• Citric acid
• 1-Hydroxyethylidene-1,1-diphosphonic acid
• Stearic acid
• Amino tris(methylene phosphonic acid)
• Ethyl 2-(Chlorosulfonyl)acetate
• Disodium pamidronate
• Zoledronic acid
• PHENYLPHOSPHONIC ACID DICHLORIDE
• Phenylphosphinic acid
• Phenylpropyl aldehyde
• Phenylpropiolic acid
• Ascoric Acid
• 1,2-BIS(DIMETHOXYPHOSPHORYL)BENZENE
• CHLOROPHOSPHONAZO III
• 4-CARBOXYPHENYLPHOSPHONIC ACID
• ETHYL PHENYLPHOSPHINATE
• Diphenylphosphinic acid