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Title:	The [2 + 2] Cycloaddition–Retroelectrocyclization and [4 + 2] Hetero-Diels–Alder Reactions of 2-(Dicyanomethylene)indan-1,3-dione with Electron-Rich Alkynes: Influence of Lewis Acids on Reactivity
Source:	Organic Letters [1523-7060] Donckele, Etienne yr:2015

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