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Homologous series of syn‐bridged annulenes are of interest for a deeper understanding of the Hückel rule. Dialdehydes like (3) could be key compounds for syntheses of such annulenes. The synthesis of (3) from the dialdehyde (1) was accomplished in three steps: reaction with (2) to give the diester, reduction to the diol, and oxidation to (3). This three‐step sequence is also suitable for synthesis of the two next higher dialdehydes with three and four CH2 groups, respectively.

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J. Am. Chem. Soc. 96, 4301 (1 974). Dissertation G. Hellmann, Universitat Freiburg 1977, und 8. Mitteilung dieser Reihe [**]. Das OL-Diastereomer zerfillt bei 300°C rnit 2.5 kcal/ mol hoherer freier Aktivierungsenthalpie (AG * ) als die meso-Form. a) H. J . Lindner. B. Kitschke, unveroffentlicht; b) H . Fritz, unveroffentlichte Ergebnisse: Die meso-Verbindung liegt in der anti-, die DL-Form in der gnuche-I-Struktur [8] vor.