乙酰乙酰-2,5-二甲氧基苯胺

1,4-dimethyl-5,8-dimethoxy-1,4-iminonaphthalene

benzyne a

5,8-dimethoxy-1,4-dimethyl-9-(trimethylsilyl)-1,4-dihydro-1,4-epiminonaphthalene