4-溴-2-乙基苯甲醛 、
2,2-dimethyl-1-oxaspiro[4.4] nonan-3-one 、
2,2-dimethyl-1-oxaspiro[4.4]nonan-4-one 在
sodium methylate 作用下,
以
乙二醇二甲醚 为溶剂,
反应 1.25h,
生成 3-[1-(4-bromo-2-ethylphenyl)methylidene]-2,2-dimethyl-1-oxaspiro[4.4]nonan-4-one 、 4-[1-(4-bromo-2-ethylphenyl)methylidene]-2,2-dimethyl-1-oxaspiro[4.4]nonan-3-one