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Heliphenes and Related Structures

This review discusses from a qualitative viewpoint three-dimensional structures (hydrocarbons and carbon allo- tropes) that can be obtained from the 4,6,12-archimedean tiling of the Euclidean plane (graphenylene net) or that are re- lated to subgraphs derived from the graphenylene net, insisting on helical structures called (n)heliphenes with alternating 4- and 6-membered conjugated rings. Analogies with benzenoid (n)helicenes allow proposals for non-planar heliphene- related structures that have yet to be explored.