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Butyraldehyde, also known as butanal, is an organic compound that is the aldehyde analog of butane as well as an isomer of butanone. It is a colorless flammable liquid with an acrid smell.  It is miscible with most organic solvents.
It can be produced by catalytic dehydrogenation of n-butanol, catalytic hydrogenation of crotonaldehyde, or via the hydroformylation of propylene.
Upon exposure to air, it is oxidized to form butyric acid.
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