A 2-formylacetic ester derivative represented by the general formula (5) is provided:
where R
4
represents an alkyl group having 2 to 6 carbon atoms; R
5
represents an alkyl group having 1 to 10 carbon atoms; and X represents H, Li, Na or K.
提供一种由一般式(5)表示的2-甲酰基
乙酸酯衍
生物:其中R4代表具有2至6个碳原子的烷基;R5代表具有1至10个碳原子的烷基;X代表H、Li、Na或K。