Dibenzofuran

Dibenzofuran is a heterocyclic organic compound with the chemical structure shown at right. It is an aromatic compound that has two benzene rings fused to a central furan ring. All the numbered carbon atoms have a hydrogen atom bonded to each of them. It is a volatile white solid that is soluble in nonpolar organic solvents. It is obtained from coal tar, where it exists as a 1% component.[1]

Dibenzofuran
Names
Preferred IUPAC name
Dibenzo[b,d]furan
Identifiers
3D model (JSmol)
3DMet
121100
ChEBI
ChEMBL
ChemSpider
ECHA InfoCard 100.004.612
EC Number
  • 205-071-3
67825
KEGG
UNII
UN number 3077
Properties
C12H8O
Molar mass 168.19 g/mol
Appearance white crystalline powder
Melting point 81 to 85 °C (178 to 185 °F; 354 to 358 K)
Boiling point 285 °C (545 °F; 558 K)
Insoluble
Hazards
GHS pictograms
GHS Signal word Warning
H302, H312, H332, H411
P273, P391, P501
Related compounds
Related compounds
 Furan
Benzofuran
Dibenzodioxin
Dibenzothiophene
Carbazole
Polyozellin (compound with a kernel with two dibenzofurans that share the same benzene ring)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Reactions

Dibenzofuran is thermally robust with a convenient liquid range. These properties, together with its low toxicity, are exploited by the use of DBF as a heat transfer agent.[1]

It undergoes electrophilic reactions, such as halogenation and Friedel-Crafts reactions. Reaction of DBF with butyl lithium results in dilithiation.[2]

Dibenzofuran is the precursor to the drug furobufen by Friedel-Crafts reaction with succinic anhydride.

Safety

Dibenzofuran is a relatively non-toxic compound as evidenced by rats being unaffected after a 200-day diet consisting of 0.025 – 0.4% of DBF.[1] The polychlorinated dibenzofurans are however among the potentially toxic dioxins and dioxin-like compounds.

Dibenzofuran is cited in the United States Clean Air Act 1990 Amendments -Hazardous Air Pollutants as a volatile hazardous air pollutant of potential concern. The Superfund Amendment Reauthorization Act (SARA) Section 110 placed dibenzofuran on the revised Agency for Toxic Substances and Disease Registry (ATSDR) priority list of hazardous substances to be the subject of a toxicological profile. The listing was based on the substance’s frequency of occurrence at Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) National Priorities List sites, its toxicity, and/or its potential for human exposure.[3]

See also

References
  1. Gerd Collin and Hartmut Höke "Benzofurans" in Ullmann's Encyclopedia of Industrial Chemistry, 2007, Wiley-VCH, Weinheim. doi:10.1002/14356007.l03_l01
  2. Ulrich Iserloh, Yoji Oderaotoshi, Shuji Kanemasa, and Dennis P. Curran "Synthesis of (R,R)-4,6-Dibenzofurandiyl-2,2'-Bis (4-Phenyloxazoline) (DBFOX/PH) – A Novel Trridentate Ligand" Org. Synth. 2003, volume 80, 46. doi:10.15227/orgsyn.080.0046
  3. "Archived copy" (PDF). Archived from the original (PDF) on 2012-10-09. Retrieved 2014-03-09.CS1 maint: archived copy as title (link)


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