2,4-Dihydroxybenzoic acid

Synonym(s):β-Resorcylic acid

cream to slightly beige or pink crystalline powder

Dihydroxybenzoic acid is a colorless solid and is used as a flavor modifier.

Reported present in avocados, beer, red wine, roast coffee, sherry, smoked sausage and white wine

2,4-Dihydroxybenzoic acid is used in Intermediates, Plasticizers, Plastic and Rubber Products, a organic building block.

Intermediate for dyestuffs and drugs; spot test reagent for iron.

2,4-Dihydroxybenzoic acid is a organic building block

Prepared from resorcinol and potassium bicarbonate in glycerol or water by heating and passing carbon dioxide through the mixture.

Crystallise the acid from water. [Beilstein 10 IV 1420.]

Melting point:	208-211 °C (dec.) (lit.)
Boiling point:	237.46°C (rough estimate)
Density	1.3725 (rough estimate)
vapor pressure	0Pa at 25℃
refractive index	1.6710 (estimate)
FEMA	3798 \| 2,4-DIHYDROXYBENZOIC ACID
Flash point:	200 °C
storage temp.	Inert atmosphere,Room Temperature
solubility	8g/l
form	Crystalline Powder
pka	3.11, 8.55, 14.0(at 25℃)
color	Cream to slightly beige or pink
Odor	at 100.00?%. mild phenolic
Water Solubility	8 g/L (20 ºC)
Merck	14,8157
JECFA Number	908
BRN	1946213
CAS DataBase Reference	89-86-1(CAS DataBase Reference)
NIST Chemistry Reference	2,4-Dihydroxybenzoic acid(89-86-1)
EPA Substance Registry System	2,4-Resorcylic acid (89-86-1)

Signal word	Warning
Pictogram(s)	Exclamation Mark Irritant GHS07
GHS Hazard Statements	H315:Skin corrosion/irritation H319:Serious eye damage/eye irritation H335:Specific target organ toxicity, single exposure;Respiratory tract irritation
Precautionary Statement Codes	P261:Avoid breathing dust/fume/gas/mist/vapours/spray. P264:Wash hands thoroughly after handling. P264:Wash skin thouroughly after handling. P280:Wear protective gloves/protective clothing/eye protection/face protection. P304+P340:IF INHALED: Remove victim to fresh air and Keep at rest in a position comfortable for breathing. P305+P351+P338:IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing. P405:Store locked up.