- The aromaticity of pyracylene: an experimental and computational study of the energetics of the hydrogenation of acenaphthylene and pyracylene. Diogo, H.P., Kiyobayashi, T., Minas da Piedade, M.E., Burlak, N., Rogers, D.W., McMasters, D., Persy, G., Wirz, J., Liebman, J.F. J. Am. Chem. Soc. (2002)