环戊酮 、 [1-ethyl-6-(1,4,5,6-tetrahydro-6-oxo-3-pyridazinyl)-2,3-dihydro-2-indolinone]-3-methylenehydrazine 以
异丙醇 为溶剂,
生成 3-[1-(N'-Cyclopentylidene-hydrazino)-meth-(E)-ylidene]-1-ethyl-6-(6-oxo-1,4,5,6-tetrahydro-pyridazin-3-yl)-1,3-dihydro-indol-2-one 、
3-[1-(N'-Cyclopentylidene-hydrazino)-meth-(Z)-ylidene]-1-ethyl-6-(6-oxo-1,4,5,6-tetrahydro-pyridazin-3-yl)-1,3-dihydro-indol-2-one