The title annulenyl anion (4) shows an over-whelming tendency for exo-face (cis to the methylene bridge) deuterium incorporation to give (5), contrary to a previous report describing the endo-deuteriation of (4).
K. Takahashi, T. Kagawa and K. Takase, J. Chem. Soc., Chem. Commun., 1979, 862 DOI: 10.1039/C39790000862
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