Metal exchange in lithiocuprates: implications for our understanding of structure and reactivity
作者:Andrew J. Peel、Ryan Ackroyd、Andrew E. H. Wheatley
DOI:10.1039/c7sc01423f
日期:——
crystalline 8, amide-bridging Cu and Li demonstrate clear preferences for di- and tricoordination, respectively. A large excess of Lewis base gives an 8-membered metallacycle that retains metal disorder and analyses as (TMP)2Cu1.35Li0.65 9 in the solid state. NMR spectroscopy identifies 9 as a mixture of (TMP)2CuLi 9a and other copper-rich species. Crystals from which the structure of 8 was obtained
新试剂已经寻求针对邻cupration中使用氰化物的试剂被消除。CuOCN在有限的供体溶剂存在下与过量的TMPLi(TMP = 2,2,6,6-四甲基哌啶)反应生成最能代表(TMP)2 Cu 0.1 Li 0.9(OCN)Li 2(THF)8的晶体,从而表示Lipshutz型Lithiocuprate(TMP)2 Cu(OCN)Li 2(THF)8a和三核(TMP)2(OCN)Li 3(THF)8b。处理TMP 2 CuLi 9a的碳氢化合物溶液用LiOCN和THF纯化得8a。同时,通过使(TMPH 2)OCN 10与TMPH和n BuLi反应,系统化8b,得到(TMP)2(OCN)Li 3(THF)2 11。观察到在硫代铜酸盐化学中低级/高级键的重要作用是观察到在结晶8中,酰胺桥连的Cu和Li分别显示出明显的偏二和三配位偏爱。大量过量的路易斯碱会形成8元金属环,保留金属无序并分析为(TMP)2