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The electronic interaction between complex bonded cyclobutadiene and the phenyl ring is analyzed by  13 C- and  1 H-NMR-spectra. The cyclobutadiene-irontricarbonyl acts electron donating via the π-system and electron accepting via the σ-core.

13 C-NMR-Spektren p-substituierter Phenylcyclobutadien-eisentricarbonyle / 13 C-MRR-Spectra of p-Substituted Cyclobutadiene-irontricarbonyls