C₄H₆O₂

The molecular formula C₄H₆O₂ may refer to:

• Butenoic acids
  • But-3-enoic acid
  • Crotonic acid
  • Isocrotonic acid
• 1,4-Butynediol
• Butyrolactones
  • β-Butyrolactone
  • γ-Butyrolactone
• Diacetyl, or butanedione
• Diepoxybutane
• 1,4-Dioxene
• Formyl acetone, technically CH₃(C=O)CH₂CHO, but it only exists as a salt of the enol, sodium formyl acetone.
• Methacrylic acid
• Methyl acrylate
• Succinaldehyde
• Vinyl acetate