The C₄-benzenes are a class of organic aromatic compounds which contain a benzene ring and four other carbon atoms. There are three tetramethylbenzenes, six dimethylethylbenzenes, three diethylbenzenes, three isopropylmethylbenzenes, three n-propylmethylbenzenes and four butylbenzenes. The saturated compounds have formula C₁₀H₁₄ and molecular weight 134.22 g/mol. C₄-benzenes are found in petroleum.^[1] Petrol (gasoline) can contain 5-8% C₄-benzenes.^[2]

• 
  1,2,3,4-Tetramethylbenzene or Prehnitene
• 
  1,3,4,5-Tetramethylbenzene or Isodurene
• 
  1,2,4,5-Tetramethylbenzene or Durene
• 
  1,2-Diethylbenzene
• 
  1,3-Diethylbenzene
• 
  1,4-Diethylbenzene
• 
  o-Cymene
• 
  m-Cymene
• 
  p-Cymene
• 
  n-Butylbenzene
• 
  Isobutylbenzene
• 
  sec-Butylbenzene
• 
  tert-Butylbenzene
• 
  Divinylbenzene

• o-Cymene
• m-Cymene
• p-Cymene

• prehnitene
• isodurene
• durene

• 1,2,3-Ethyldimethylbenzene
• 1,2,4-Ethyldimethylbenzene
• 1,2,5-Ethyldimethylbenzene
• 1,2,6-Ethyldimethylbenzene
• 1,3,4-Ethyldimethylbenzene
• 1,2,5-Ethyldimethylbenzene
• ortho-diethylbenzene
• meta-diethylbenzene
• para-diethylbenzene
• 1,2-Propylmethylbenzene
• 1,3-Propylmethylbenzene
• 1,4-Propylmethylbenzene
• n-Butylbenzene
• sec-Butylbenzene
• tert-Butylbenzene
• Isobutylbenzene

• Divinylbenzene

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