Photoactivation of Ruthenium Olefin Metathesis Initiators

UV irradiation of latent sulfur-chelated ruthenium olefin metathesis precatalysts produced a cis-dichloro−trans-dichloro photoisomerization. The enhanced activity of the trans isomer, when aromatic substituents were attached to the sulfur chelating atom, induced several metathesis reactions, including ROMP, at room temperature.对潜伏型硫螯合钌烯烃复分解（olefin metathesis）预催化剂施加紫外线辐照，可使其发生顺式二氯-反式二氯光异构化反应。当硫螯合原子连接有芳香取代基时，该反式异构体的活性显著提升，可在室温条件下引发包括开环复分解聚合（Ring-Opening Metathesis Polymerization，ROMP）在内的多种烯烃复分解反应。