Abstract
An extremely long CC single bond of 1.713 Å is found in the [2+2] cycloadduct of ortho-didehydrobenzene and tetradehydrodianthracene. The force constant of this central bond is reduced to only 30% of that of the CC bond in ethane. The corresponding CC stretching vibration (687 cm−1) in the Raman spectrum is red-shifted 300 cm−1 relative to the bands of “normal” hydrocarbons.
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