Abstract
The electronic structure of diphenoquinone was studied with the simple MO method using the similar integral values as adopted in our previous work on p-quinones. The obtained result was discussed in comparison with the previously obtained one for p-benzoquinone. As for energy levels, the lowest unfilled orbital (b2g) of diphenoquinone is far lower than the other unfilled orbitals as was obtained with the p-quinones The highest filled orbital (b1u) of diphenoquinone is considerably higher than the ones of the p-quinones. From the calculated result the intense absorption band near 390 mμ was unambiguously assigned to the A1gB3u transition.

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