1: 100 percent / 2,3-dichloro-5,6-dicyano-p-benzoquinone (DDQ) / benzene / Heating 2: 94 percent / ICl / CCl4 / 4 h / 0 - 20 °C / other silylated acenaphthenes and acenaphthylenes, reaction with sulfonation and acetylation agents View Scheme