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The complete proton resonance spectrum of 1.2-diphenyl-cyclobutadiene-irontricarbonyl was measured including all observable  13 C-H-coupling constants within the four-membered ring. The couplings were assigned. Their analysis excludes the structure of a rectangular cyclobutadiene with alternating double and single bonds; the carbon-carbon bonds of the four-membered ring have nearly uniform bond orders.

zeitschrift für naturforschung b

Protonenresonanz-spektroskopische Untersuchungen am 1.2-Diphenyl-cyclobutadien-eisentricarbonyl. Ein Beitrag zur Kenntnis der Bindungsverhältnisse im komplex-gebundenen Cyclobutadien / The Proton Resonance Spectrum of 1,2-Diphenyl-cyclobutadiene-irontricarbonyl. An Investigation on Bonding Properties in Complex Stabilized Cyclobutadiene