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Norbornadiene derivatives are able to store solar energy under isomerisation to a quadricyclane system. This energy can be liberated by a transition‐metal catalysed back reaction. With methanol as a solvent during the isomerisation of dimethylquadri‐cyclanedicarboxylate I to the dimethylnorbornadienedicarboxylate II the isomeric nortricyclylmethylethers IIIa and IVa are formed as by‐products. In the presence of water the formation of the alcohols IIIb and IVb has been observed. As a result of the side‐reactions observed, it is concluded that this solar‐energy storage system I→II offers no practicability.

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Bei der Bestrahlung von Norbornadienen mit Sonnenlicht tritt eine photochemische Umlagerung zu Quadricyclanen ein, in denen die Lichtenergie in Form der Ringspannungsenergie gespeichert ist.