a colourless liquid, C5H4O2, b.p. 162°C, which darkens on standing in air. It is the aldehyde derivative of furan and occurs in various essential oils and in fusel oil.
The alcohol sample is mixed with aniline and glacial acetic acid. The presence of furfural is indicated by a salmon pink colour appearing in the solution within 20 minutes of mixing.
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It is used as a solvent for extracting mineral oils and natural resins and itself forms resins with some aromatic compounds.
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