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Ultralong C-C bonds in hexaphenylethane derivatives
2008
Pure and Applied Chemistry
The longer C-C bond than the standard (1.54 Å) is so weakened that it is cleaved easily, as found in the parent hexaphenylethane (HPE). However, the compounds with an ultralong C-C bond (1.75 Å) can be isolated as stable solids when the bond-dissociated species does not undergo any reactions other than bond reformation. This is the central point in designing the highly strained HPEs, which were obtained by two-electron reduction of the corresponding dications. Steric repulsion of "front strain"
doi:10.1351/pac200880030547
fatcat:xazpkye5yzdxth2qacfzsbinym