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This article contains stereodiagrams: stereoviewing glasses are recommended.
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Scheffer, J.R., Trotter, J. The generation and behavior of biradical intermediates in crystalline media. Reviews of Chemical Intermediates 9, 271–305 (1988). https://doi.org/10.1007/BF03155686
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DOI: https://doi.org/10.1007/BF03155686