[5.5.5.5]hexaene is a [12]annulene ring with symmetrically bound carbon atom in its center. This the smallest hydrocarbon hyperbolic paraboloid shape. and related hydrocarbons are important building blocks organic materials chemistry. For example, penta-graphene—a puckered 2D allotrope of carbon—is comprised similar repeating subunits. Here, we investigate thermochemical kinetic properties at C...