Magnetic circular dichroism and absorption spectra of 1,3-bis(3,5-di-t-butyl-4-oxo-2,5-cyclo-hexadiene-1-ylidine) cyclobutanedione (1) have been measured. The absorption spectrum was assigned by comparing the experimental results for the signs of Faraday B term, dipole strengths and transition energies with those computed using the Pariser–Parr–Pople–SCF-π-MO CI method with variable bond-length.
H. Yamaguchi, K. Ninomiya and R. West, J. Chem. Soc., Faraday Trans. 2, 1981, 77, 2141 DOI: 10.1039/F29817702141
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