Heptan er en fællesbetegnelse for en alkan med 7 kulstofatomer.

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Eksempel på en strukturformel af heptan

Isomerer

Der findes 9 isomerer af heptan:

  • n-heptan CH3CH2CH2CH2CH2CH2CH3
  • 2-methylhexan (isoheptan) CH3CH(CH3)CH2CH2CH2CH3
  • 3-methylhexan CH3CH2CH(CH3)CH2CH2CH3
  • 2,2-(di)methylpentan (neoheptan) CH3C(CH3)2CH2CH2CH3
  • 2,3-(di)methylpentan CH3CH(CH3)CH(CH3)CH2CH3
  • 2,4-(di)methylpentan CH3CH(CH3)CH2CH(CH3)CH3
  • 3,3-(di)methylpentan CH3CH2C(CH3)2CH2CH3
  • 3-ethylpentan CH3CH2CH(CH2CH3)CH2CH3
  • 2,2,3-(tri)methylbutan CH3C(CH3)2CH(CH3)CH3
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