The story
Discovered by German chemist Rainer Ludwig Claisen.
Etymology from Wiktionary, CC BY-SA 4.0.
Claisen rearrangement
Today it means: A powerful carbon–carbon bond-forming chemical reaction, in which the heating of an allyl vinyl ether initiates a [3,3]-sigmatropic rearrangement to give a γ,δ-unsaturated carbonyl. Full definition →