Baeyer's reagent
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Baeyer's Reagent is used in organic chemistry as a test for the presence of unsaturation, such as double bonds (a similar test can be performed with bromine). It is a solution of alkaline potassium permanganate, which is a powerful oxidant. Reaction with double or triple bonds (-C=C- or -C≡C-) in an organic material causes the color to fade from purplish-pink to brown. Aldehydes and formic acid (and formic acid esters) also give a positive test.[1] It is a very interesting reaction.
It is named for the German organic chemist Adolf von Baeyer.
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