Abscisic acid and its methyl ester are converted by acid-catalysed dehydration into neutral products, one of which has been identified as an unsaturated γ-lactone. It gives an intense violet-red colour with alkalis, which fades as the lactone is hydrolysed. This reaction is a useful qualitative test for abscisic acid.
R. Mallaby and G. Ryback, J. Chem. Soc., Perkin Trans. 2, 1972, 919 DOI: 10.1039/P29720000919
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