The photoelectron spectra of the iron tricarbonyl complexes of cis-buta-1,3-diene and cyclobutadiene in conjunction with appropriate SCF MO calculations indicate that the first and second ionization potentials of cyclobutadiene are ca. 8·5 and 11·7 ev, respectively.
S. D. Worley, J. Chem. Soc. D, 1970, 980 DOI: 10.1039/C29700000980
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