The reaction between 1,3-dimesitylbenzo[c]furan and 4-phenyltriazoline -3,5-dione affords a sterically stabilised zwitterion that 110 °C decomposes to the N-isocyanatoimine (13) which adds to olefinic and acetylenic traps to form stable zwitterions of the type (6) and (9), respectively; (9) isomerises to (10) at 110 °C.
D. W. Jones, J. Chem. Soc., Chem. Commun., 1982, 766 DOI: 10.1039/C39820000766
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