双键

Compared with diolefine rubber,EPDM has less double bond.

与二烯橡胶相比,EPDM的很少。

Ring closing metathesis (RCM) of dienes to cycloalkene provides an important tool for C-C double bond formation catalyzed by metal carbene.

关环转换反应是形成碳碳的重要反应之一,即烯合物在金属碳烯关环得到环烯类合物。

Ethyl phenylacrylate intermediate bringing a double bond was introduced first,which is subsequently transformed into triketone and then DCM was obtained with high purity.

采用具有烯骨架的β-苯基丙烯酸酯为中间体先引,再经过三酮合环制备乙烯基吡喃。

Interestingly, in spite of its instability, the O3 molecule can be stabilized as an ozonide between the double bonds of a monounsaturated fatty acid such as oleic acid.

有趣的是，尽管不稳定，超氧O3分子却能以结合安定于像油酸那样的单元不饱和脂肪酸形成超氧O3物。