Propionaldehyde is the organic compound with the formula CH3CH2CHO.
It is a saturated 3-carbon aldehyde and is a structural
isomer of acetone. It is a colourless liquid with a slightly irritating,
It is principally used as a precursor to trimethylolethane (CH3C(CH2OH)3) through a condensation reaction with formaldehyde; this triol is an important intermediate in the production of alkyd resins. Other applications include reduction to propanol and oxidation to propionic acid.