Thermolysis of the α-diazoketone (1) at 80 °C generates the electron-rich heptafulvene (2); the alkylidenecarbene (5) is the key intermediate of the reaction sequence.
R. Brückmann and G. Maas, J. Chem. Soc., Chem. Commun., 1986, 1782 DOI: 10.1039/C39860001782
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