Tetraphenylene is an organic compound, solid at room temperature, with the chemical formula C24H16. It is a member of the unsaturated polycyclic hydrocarbons class of compounds and a tetramer of benzyne. Tetraphenylene is an organic compound, solid at room temperature, with the chemical formula C24H16. It is a member of the unsaturated polycyclic hydrocarbons class of compounds and a tetramer of benzyne.