Two new derivatives of 4 - dicyanomethylene - 2,6 - dimethyl - 4H - pyran and the corresponding poly (amic acid) were synthesized and characterized.

• 两种新的4-二氰亚甲基-2；6-二甲基-4H-吡喃衍生物及对应的聚酰胺酸被合成和表征.