第三为不饱和烯烃；
烯烃：含有一对或多对由双键连接的碳原子的一类不饱和烃。
Olefin (or alkene) Any unsaturated hydrocarbon containing one or more pairs of carbon atoms linked by a double Bond (see covalent Bond, saturation).
它为使不饱和酸变成相应的烯烃提供了一个有用的中间体。
It provides a useful vehicle for transforming unsaturated acids to their corresponding alkenes.
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