Phenylacetone (1-phenyl-2-probanone) is a colourless to pale yellow liquid with a strong, characteristic odour. Phenylacetone is used in the chemical industry for synthesis purposes; it can be used to produce amphetamine by means of reductive amination. Phenylacetone is highly flammable and toxic. It is both a synthesis by-product and a potential extender; the powdered amphetamine sulphate can be reliquefied and the product sold as amphetamine paste.

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