Phenylphosphonic acid

Synonym(s):Benzene phosphonic acid

CAS NO.：1571-33-1
Empirical Formula: C6H7O3P
Molecular Weight: 158.09
MDL number: MFCD00002136
EINECS: 216-388-1
SAFETY DATA SHEET (SDS)
Update Date: 2024-12-18 14:15:32

What is Phenylphosphonic acid?

Chemical properties

white to off-white crystalline powder

The Uses of Phenylphosphonic acid

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.

The Uses of Phenylphosphonic acid

Intermediate in antifouling paint agents; catalyst in organic reactions.

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.]

Properties of Phenylphosphonic acid

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
CAS DataBase Reference	1571-33-1(CAS DataBase Reference)
EPA Substance Registry System	Phosphonic acid, phenyl- (1571-33-1)

Safety information for Phenylphosphonic acid

Signal word	Danger
Pictogram(s)	Corrosion Corrosives GHS05 Exclamation Mark Irritant GHS07
GHS Hazard Statements	H302:Acute toxicity,oral H314:Skin corrosion/irritation
Precautionary Statement Codes	P260:Do not breathe dust/fume/gas/mist/vapours/spray. P270:Do not eat, drink or smoke when using this product. P280:Wear protective gloves/protective clothing/eye protection/face protection. P301+P312:IF SWALLOWED: call a POISON CENTER or doctor/physician IF you feel unwell. P303+P361+P353:IF ON SKIN (or hair): Remove/Take off Immediately all contaminated clothing. Rinse SKIN with water/shower. P305+P351+P338:IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.