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Structural formula
Structure of acenaphthene
Surname Acenaphthene
other names
  • 1,2-dihydroacenaphthylene
  • 1,8-ethylene naphthalene
Molecular formula C 12 H 10
Brief description

colorless needles

External identifiers / databases
CAS number 83-32-9
EC number 201-469-6
ECHA InfoCard 100.001.336
PubChem 6734
Wikidata Q415103
Molar mass 154.21 g mol −1
Physical state



1.15 g cm −3 (20 ° C)

Melting point

95 ° C

boiling point

278 ° C

Vapor pressure

0.31 Pa (25 ° C)

Refractive index

1.6048 (95 ° C)

safety instructions
GHS labeling of hazardous substances
07 - Warning 09 - Dangerous for the environment


H and P phrases H: 315-319-335-410
P: 261-273-305 + 351 + 338-501
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions . Refractive index: Na-D line , 20 ° C

Acenaphthene (1,2-dihydroacenaphthylene; 1,8-ethylene naphthalene) is a white to slightly yellowish solid that belongs to the polycyclic aromatic hydrocarbons . Acenaphthene is found to 0.3% in coal tar .


Acenaphthene is practically insoluble in water, but readily soluble in benzene , ether , chloroform and heated alcohol . The compound decomposes from 476 ° C.


Acenaphthene is required for the production of plastics, dyes, insecticides and pharmaceutical products, but mainly for the large-scale production of naphthalic anhydride . Technically, it is obtained by hydrogenating acenaphthylene .

Individual evidence

  1. a b c d e Entry on 1,2-dihydroacenaphthylene. In: Römpp Online . Georg Thieme Verlag, accessed on November 12, 2014.
  2. a b c d e f Entry on acenaphthene in the GESTIS substance database of the IFA , accessed on June 17, 2016(JavaScript required) .
  3. State Institute for Environmental Protection Baden-Württemberg: Substance behavior of gas works-specific PAHs , ISSN  0941-780X , 1997
  4. David R. Lide (Ed.): CRC Handbook of Chemistry and Physics . 90th edition. (Internet version: 2010), CRC Press / Taylor and Francis, Boca Raton, FL, Physical Constants of Organic Compounds, pp. 3-4.