Planar-tetracoordinate carbon in a neutral saturated hydrocarbon: theoretical design and characterization
Exact planarity at the central carbon atom is achieved, according to molecular orbital calculations, in the strained polycyclic cage hydrocarbon dimethanospiro[2.2]octaplane (see structure). There are no glaringly long C-C bonds, which might have reflected inherent instability in this molecule that is yet to be synthesized.
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