Method for preparing 2,6-dimethyl anthracene from isoprene and 1,4-benzoquinone

The invention relates to a method for preparing 2, 6-dimethyl anthracene from isoprene and 1, 4-benzoquinone. The process is completed through two steps, firstly, isoprene and 1, 4-benzoquinone are subjected to a two-step Diels-Alder reaction at 80-170 DEG C to generate a dimethyl decahydroanthradione intermediate product, and then the dimethyl decahydroanthradione intermediate product is subjected to dehydrogenation and deoxidation reactions under the action of a metal catalyst to generate 2, 6-dimethyl anthracene. According to the first-step reaction, isoprene and 1, 4-benzoquinone which arederived from biomass resources are used as raw materials, and an intermediate product dimethyl decahydroanthradione is obtained in a tank reactor through common heating or microwave heating; dehydrogenation and deoxidation reactions are carried out in a fixed bed reactor, and a reaction intermediate is directly injected into a reaction tube or passes through a catalyst bed layer under purging ofcarrier gas to obtain 2, 6