Benzofuran Property

Melting point:

<-18℃

Boiling point:

173-175 °C(lit.)

Density 

1.095 g/mL at 20 °C(lit.)

refractive index 

n20/D 1.567

Flash point:

133 °F

storage temp. 

2-8°C

solubility 

soluble in Dichloromethane

pka

33.2

form 

Crystalline Powder or Crystals

color 

Yellow to green to yellow-brown

Water Solubility 

insoluble

Merck 

14,1088

BRN 

107704

LogP

2.670

CAS DataBase Reference

271-89-6(CAS DataBase Reference)

IARC

2B (Vol. 63) 1995

NIST Chemistry Reference

Benzofuran(271-89-6)

EPA Substance Registry System

Benzofuran (271-89-6)

Safety

Hazard Codes 

Xn,Xi

Risk Statements 

40-52-10

Safety Statements 

36/37-16

RIDADR 

UN 1993 3/PG 3

WGK Germany 

3

RTECS 

DF6423800

F 

10-23

Hazard Note 

Irritant

TSCA 

Yes

HazardClass 

3

PackingGroup 

III

HS Code 

29329900

Hazardous Substances Data

271-89-6(Hazardous Substances Data)

Toxicity

Isolated from coal oil and used in the manufacture of coumarone-indene resin. This resin is used in paints, glue, etc. and is allowed in food packaging. Little is known about the toxicity of benzofuran to humans but acute toxicity in experimental animals involves liver and kidney failure. Chronic toxicity to animals involves damage to the liver, kidneys, lungs, and stomach. Lifetime administration (oral administration) caused cancer in both rats and mice.

Hazard and Precautionary Statements (GHS)

Symbol(GHS)

Signal word

Warning

Hazard statements

H226Flammable liquid and vapour

H351Suspected of causing cancer

Precautionary statements

P201Obtain special instructions before use.

P210Keep away from heat/sparks/open flames/hot surfaces. — No smoking.

P308+P313IF exposed or concerned: Get medical advice/attention.

Benzofuran Chemical Properties,Usage,Production

Chemical Properties

2,3-Benzofuran is a colorless, sweet-smelling, oily liquid made by processing coal into coal oil. It may also be formed during other uses of coal or oil. 2,3-Benzofuran is not used for any commercial purposes, but the part of the coal oil that contains 2,3-benzofuran is made into a plastic called coumarone-indene resin. This resin resists corrosion and is used to make paints and varnishes. The resin also provides water resistance and is used in coatings on paper products and fabrics. It is used as an adhesive in food containers and some asphalt fl oor tiles. The resin has been approved for use in food packages and as a coating on citrus fruits. We do not know how often the resin is used or whether any 2,3-benzofuran in the coating or packaging gets into the food. 2,3-Benzofuran may enter the air, water, and soil during its manufacture, use, or storage at hazardous waste sites. Breathing contaminated air or touching the chemical in the workplace is the source of human exposure.

Uses

As an intermediate in the polymerization of coumarone-indene resins found in various corrosion-resistant coatings such as paints and varnishes; in water-resistant coatings for paper products and fabrics; in adhesives for use in food containers

Uses

Benzo[b]furan is used in the manufacture of coumarone-indene resin. It has been used to make floor tiles and other products. It is also used as a coating on grapefruit, lemons, lirnes, oranges, tangelos and tangerines and in the production of COITosion-resistant paints and varnishes, in water-resistant coatings on paper products and fabrics and as adhesives in food containers.

Uses

manufacture of coumarone-indene resins.

Definition

A bicyclic ring compound derived from coal tar naphtha, the parent substance of coumarone-indene resins.

Synthesis Reference(s)

The Journal of Organic Chemistry, 44, p. 28, 1979 DOI: 10.1021/jo01315a008

General Description

Clear oily yellow liquid with an aromatic odor.

Air & Water Reactions

Highly flammable. May be sensitive to prolonged exposure to air. Very slightly water soluble.

Reactivity Profile

Benzofuran slowly polymerizes on standing. Benzofuran may be sensitive to prolonged exposure to air. Benzofuran is polymerized by H2SO4.

Hazard

Possible carcinogen.

Health Hazard

ACUTE/CHRONIC HAZARDS: When heated to decomposition Benzofuran emits acrid and irritating smoke and fumes.

Health Hazard

Rats and mice that ingested high levels of 2,3-benzofuran over a short time had liver and kidney damage. Those exposed over a long time to moderate levels had liver, kidney, lung, and stomach damage. In one study, the ability of animals to reproduce was not affected. We do not know if people will experience health effects similar to those seen in animals.

Fire Hazard

Benzofuran is combustible.

Carcinogenicity

Benzofuran was not mutagenic in bacterial assays but did cause chromosomal aberrations and sister chromatid exchanges in cultured rodent cells.

Purification Methods

Benzofuran is steam distilled, dissolved in Et2O, washed with 5% aqueous NaOH, saturated NaCl, dried (Na2SO4), evaporated and redistilled. UV: max 245, 275, 282nm (log 4.08, 3.45, 3.48). The picrate has m 102-103o. [Burgstahler & Worden Org Synth Coll Vol V 251 1973, NMR: Black & Heffernan Aust J Chem 18 353 1965, Beilstein 17/2 V 3.]