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.
不饱和碳氢化合物，属于烯烃同系物。
An unsaturated hydrocarbon belonging to the alkene homologous series.
所述载体催化剂可用于由气相的烯烃制备不饱和酯。
The carrier catalyst can be used for preparing unsaturated ester by gas phase olefin.
所述载体催化剂可用于由气相的烯烃制备不饱和酯。
The carrier catalyst can be used for preparing unsaturated ester by gas phase olefin.
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