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  • Title: Regioselective and stepwise [8 + 2] cycloaddition reaction between alkynyl-Fischer carbene complexes and tropothione.
    Author: Rivero AR, Fernández I, Sierra MA.
    Journal: J Org Chem; 2012 Aug 03; 77(15):6648-52. PubMed ID: 22780846.
    Abstract:
    The formal [8 + 2] cycloaddition reaction between alkynyl Fischer carbene complexes and tropothione leads to the regioselective formation of novel 3aH-cyclohepta[b]thiophene carbene complexes. Computational DFT calculations indicate that the process proceeds stepwise via antiaromatic zwitterionic intermediates.
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