(Z)-3-(N',N'-Dimethyl-hydrazino)-but-2-enoic acid 4-[(Z)-3-(N',N'-dimethyl-hydrazino)-but-2-enoyloxy]-cyclohexyl ester 、
氯甲酸苯酯 在
吡啶 作用下,
以
1,4-二氧六环 为溶剂,
以20%的产率得到2,2',5,5'-Tetrahydro-1,1,1',1',3,3'-hexamethyl-5,5'-dioxo-4,4'-(1,4-cyclohexandiyldioxy)di(1H-pyrazolium-2-id)