Organic metathesis reactions are an important category of chemical transformations characterized by the transposition/redistribution of molecular fragments between two chemical entities. The efficient exchanged bonding of large whole-piece building blocks allows the straightforward one-step generation of structural complexity and diversity, thus offering unique synthetic advantages as compared to the step-by-step assembly approach. As a result, extensive work has been undertaken for the development of various metathesis reactivity modes. In this regard, the classic olefin-olefin metathesis has demonstrated its powerful utility in organic synthesis, drug discovery, and materials engineering.