2,3-Dichloro-5,6-dicyano-p-quinone is a strong oxidation reagent, which is widely used in dehydrogenation of compounds, especially for steroids. It has good selectivity. It is an indispensable oxidation reagent in steroidal industry. With the deepening of research, it is gradually found that DDQ has a good application prospect in many organic reactions. For example, selective oxidation of alcohols, oxidation of aryl benzyl sites, carbon carbon bond formation, carbon heterobond formation, cyclization, protection and deprotection, etc.