Straightforward Access to Terminally Disubstituted Electron‐Deficient Alkylidene Cyclopent‐2‐en‐4‐ones through Olefination with α‐Carbonyl and α‐Cyano Secondary Alkyl Sulfones - Trifonov - 2021 - European Journal of Organic Chemistry - Wiley Online Library

Visible light/copper catalysis enabled Heck-like coupling between alkenes and cyclic sulfonium salts via selective C–S bond cleavage - Organic Chemistry Frontiers (RSC Publishing)

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Consider the reaction of 2-cyclopenten-1-one with

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7.7: Aromatic Ions - Chemistry LibreTexts

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Yb(OTf)3-catalyzed cyclization of an N-silylenamine with 2-methylene-1,3-cyclohexanedione to afford a 7,8-dihydroquinolin-5(6H)-one derivative and its application to the one-pot conversion to a 2,3,5-trisubstituted quinoline derivative - ScienceDirect

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Chem 353 Winter '09 MT : Synthesis