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The proton magnetic resonance spectra of 1.6-methano- and 1.6-oxido-cyclodecapentaene are described and analyzed in terms of chemical shifts and coupling constants. The results are discussed in connection with the structure and possible aromatic character of these compounds. Measurements of the concentration dependence of the chloroform resonance signal in solutions of both compounds give additional support for the presence of a delocalized 10 π-electron system.

Protonenresonanz-Spektroskopie ungesättigter Ringsysteme I: Die Analyse der Spektren von 1.6-Methano- und 1.6-Oxydo-Cyclodecapentaen