The reduction of 1,1,4,4-tetraphenylbutadiene in ether solution at sodium or potassium metal mirrors proceeds via C![[double bond, length half m-dash]](https://www.rsc.org/images/entities/char_e006.gif)
C double bond shifts and yields either a monomeric contact ion triple unit {tetraphenylbutadiene2–-[Na+(dimethoxyethane)2]2}1, or a polymeric contact ion aggregate, [tetraphenylbutadiene2–(K+ diethyl ether)2]∞.
H. Bock, C. Näther and K. Ruppert, J. Chem. Soc., Chem. Commun., 1992, 765 DOI: 10.1039/C39920000765
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