| | Benzofuran Basic information |
| | Benzofuran Chemical Properties |
| Melting point | <-18℃ | | Boiling point | 173-175 °C(lit.) | | density | 1.095 g/mL at 20 °C(lit.) | | refractive index | n20/D 1.567 | | Fp | 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) |
| 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. |
| | Benzofuran Usage And Synthesis |
| 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 | manufacture of coumarone-indene resins. | | 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. | | 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.] |
| | Benzofuran Preparation Products And Raw materials |
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