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Regioselective and Stepwise [8 + 2] Cycloaddition Reaction between Alkynyl–Fischer Carbene Complexes and Tropothione

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journal contribution
posted on 03.08.2012, 00:00 by Alexandra R. Rivero, Israel Fernández, Miguel A. Sierra
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