1-Methyl-3-methylene-2,4(1H,3H)-quinolinedione  (2), prepared from 4-hydroxy-1,3-dimethyl-2 (1H)-quinolinone  (1) and 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ) gives the  dimer 3. Compound 2 also reacts in situ  with 2,2-dimethyl-2H-1-benzopyran and with isopropenyl acetate to  give Diels-Alder cycloaddition products.
                                    1-甲基-3-亚甲基-2,4(1H,3H)-
喹啉酮 (2) 由 
4-羟基-1,3-二甲基-2(1H)-
喹啉酮 (1) 和 
2,3-二氯-5,6-二氰基-1,4-苯醌 (
DDQ) 制备而成,生成二聚体 3。化合物 2 还可以在原位与 2,2-二甲基-2H-1-苯并
吡喃和异
丙烯基
醋酸酯反应,形成迪尔斯-阿尔德环加成产物。