a five-membered chelate ring. Compounds 2–4 were applied to the UV-induced ring-opening metathesis polymerization (ROMP) of cis-cyclooctene (5) and dicyclopentadiene (6). Whereas all three precatalysts show pronounced thermal latency in the presence of 5 or 6, only compound 2 displays significant photo-ROMP activity. The photoreactivity of precatalysts 2–4, which decreases with increasing electron-withdrawing
三种新型
钌 (II) 配合物 RuX2(IMesH2)[N,N-二乙基-N'-(2-亚苄基)
三氮烯] [IMesH2 = 1,3-二甲基
咪唑啉-2-亚基;X = Cl– (2), CF3COO– (3), C6F5COO– (4)] 进行了描述。化合物 2-4 的单晶 X 射线结构分析表明,
三氮烯配体以反式形式存在,
三氮烯的芳基连接的氮原子与
钌原子结合形成五元螯合环。将化合物 2-4 应用于顺式环
辛烯 (5) 和双
环戊二烯 (6) 的紫外线诱导开环复分解聚合 (ROMP)。虽然所有三种预催化剂在 5 或 6 存在下都显示出明显的热潜伏期,但只有化合物 2 显示出显着的光-ROMP 活性。预催化剂 2-4 的光反应性,