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Attempts to obtain 2,3,5,6-substituted norbornadienes without the exocyclic double bond by Diels-Alder reaction of 2,3-disubstituted cyclopentadienes and dimethylacetylene dicarboxylate led to 1,2,3,5-substituted norbornadienes (M. Gay, dissertation, Universität Erlangen, 1999) A selective Pd-or Pt-catalyzed hydrogenation of the isopropylidene group failed.
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The sign for the single electron is placed on the C atom with the highest spin density, the + sign is placed on the C atom with the highest charge or on the second trivalent C atom. Double bonds are drawn between the C atoms with the shortest bond length.
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