Expanding the chemical space for push-pull chromophores by non-concerted [2+2] and [4+2] cycloadditions: access to a highly functionalised 6,6-dicyanopentafulvene with an intense, low-energy charge-transfer band.
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F. Diederich | W. Schweizer | J. Gisselbrecht | C. Boudon | B. Bernet | G. Jayamurugan | Franziska Schoenebeck