2-(4-CHLORO-2-NITROPHENYL)ACETIC ACID Property

Melting point:

155 °C

Boiling point:

361.2±27.0 °C(Predicted)

Density 

1.532±0.06 g/cm3(Predicted)

pka

3.81±0.10(Predicted)

Hazard and Precautionary Statements (GHS)

Symbol(GHS)

Signal word

Warning

Hazard statements

H302Harmful if swallowed

H315Causes skin irritation

H319Causes serious eye irritation

H335May cause respiratory irritation

Precautionary statements

P261Avoid breathing dust/fume/gas/mist/vapours/spray.

P305+P351+P338IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.

2-(4-CHLORO-2-NITROPHENYL)ACETIC ACID Chemical Properties,Usage,Production

Preparation

The filtrate of Step A, above, is adjusted to pH 8-9 with 2 N sodium hydroxide and is heated at 35-40 °C. while adding a 3-6% aqueous hydrogen peroxide solu tion until samples no longer turn dark on treatment with 2N sodium hydroxide. The tan precipitate is suspended in 1500 ml. of water, adjusted to pH 8-9 and similarly treated with aqueous hydrogen peroxide. The combined reaction mixtures are then acidified with concentrated hydrochloride acid to obtain a precipitate which are re covered by filtration, washed 3 times with water and dried in vacuo. The crude product (mp 145-150°C) is recrystallized from ether to obtain 4-chloro-2-nitro phenylacetic acid, m.p. 156-159°C.