Adducts of carbenes with group II and XII metallocenes
Adducts of carbenes with group II and XII metallocenes
复制标题
DOI：
10.1021/om980438w
复制
发表时间：
1998-07-20
期刊：
影响因子：
2.8
通讯作者：
Tamm, M
中科院分区：
文献类型：
--
作者：
Arduengo, AJ;Davidson, F;Tamm, M
本文报道了1，3，4，5-四甲基咪唑-2-亚基与双（五甲基咪唑）镁、双（五甲基咪唑）钙、双（五甲基咪唑）锶、双（五甲基咪唑）钡、双（五甲基咪唑）锌的反应及加成产物. 1，3，4，5-四甲基咪唑-2-亚基与双（五甲基咪唑）锌的加合物显示了锌仅与三个配位基团σ键合的结构。在碱土金属加合物中，与1，3，4，5-四甲基咪唑-2-亚基的前卡宾中心的σ键合相互作用在每个结构中显示出最短的金属-碳距离，但卡宾-金属和五甲基环戊二烯基-金属距离之间的差异随着金属原子序数的增加而减小。
The reactions and adducts of 1,3,4,5 -tetramethylimidazol-2-ylidene with bis(pentamethylcyclopentadienyl)magnesium, -calcium, -strontium, -barium, or -zinc are described. A consistent tend in the spectroscopic properties and structures of the alkaline earth metallocenes is observed, The adduct between 1,3,4,5-tetramethylimidazol-2-ylidene and bis(pentamethylcyclopentadienyl)zinc shows a structure in which the zinc is only sigma-bonded to the three ligating groups. Among the alkaline earth adducts, the sigma-bonded interaction to the former carbene center of the 1,3,4,5-tetramethylimidazol-2-ylidene shows the shortest metal-carbon distances in each of the structures but the difference between the carbene-metal and pentamethylcyclopentadienyl-metal distances decreases as the atomic number of the metal increases.