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The syntheses of some p- substituted phenylcyclobutadieneirontricarbonyls are reported. Carbonyl stretching frequencies,  13 C-H- and H-Η-coupling constants are discussed with respect to bonding properties. There is apparently no conjugative interaction between the π-electron systems of cyclobutadiene and the phenyl ring.

zeitschrift für naturforschung b

Über Substituenten-Einflüsse auf die Bindungsverhältnisse der Metall-Komplexe des Cyclobutadiens / The Influence of Substituents on Bonding Properties in Metal Complexes of Cyclobutadiene: p-Substituierte Phenylcyclobutadien-eisentricarbonyle / p-Substituted Phenylcyclobutadiene Irontricarbonyls