Divergent reactivity of a new dinuclear xanthene-bridged bis(iminopyridine) di-nickel complex with alkynes
作者:Ryan L. Hollingsworth、Amarnath Bheemaraju、Nicole Lenca、Richard L. Lord、Stanislav Groysman
DOI:10.1039/c6dt04532d
日期:——
Increasing catalyst loading to 5 mol% leads to the full conversion of ethyl propiolate to benzene products; no cyclotetramerisation products were observed. In contrast, the reaction is significantly more sluggish with methyl propargyl ether. Using 1 mol% of the catalyst, only 25% conversion of methyl propargyl ether was observed within 24 h at room temperature. Furthermore, methyl propargyl ether demonstrates
带有x吨连接基的双核双(亚氨基吡啶)配体L的反应(L = N,N '-(2,7-二叔丁基-9,9-二甲基-9 H--吨-4,5-二基)与Ni 2(COD)2(DPA)(COD =环辛二烯,DPA =二苯基乙炔)的双(1-(吡啶-2-基)甲亚胺))导致新的双核络合物Ni 2(L)(DPA)的形成)。倪2(L)(DPA)也可以在一锅反应涉及的Ni(COD)得到2,DPA和Ni中的L的X射线结构2(L)(DPA)揭示了两个方面的Ni中心由DPA配体桥接。DFT计算表明该物种具有Ni I彼此反铁磁的中心及其亚氨基吡啶配体自由基。用一当量的丙酸乙酯(HCCCO 2 Et)处理Ni 2(L)(DPA)形成Ni 2(L)(HCCCO 2 Et)络合物。第二当量丙酸乙酯的加入导致通过1 H NMR光谱观察到环三聚产物。在催化条件下(1摩尔%的Ni 2(L)(DPA),在室温下放置24小时,进行24小时)进