Adducts of Carbenes with Group II and XII Metallocenes
详细信息 查看全文
- 作者：Anthony J. Arduengo ; III ; Fredric Davidson ; Roland Krafczyk ; William J. Marshall ; and Matthias Tamm
- 刊名：Organometallics
- 出版年：1998
- 出版时间：July 20, 1998
- 年：1998
- 卷：17
- 期：15
- 页码：3375 - 3382
- 全文大小：233K
- 年卷期：v.17,no.15(July 20, 1998)
- ISSN：1520-6041
文摘
The reactions and adducts of 1,3,4,5-tetramethylimidazol-2-ylidene with bis(pentamethylcyclopentadienyl)magnesium, -calcium, -strontium, -barium, or -zinc are described. Aconsistent tend in the spectroscopic properties and structures of the alkaline earthmetallocenes is observed. The adduct between 1,3,4,5-tetramethylimidazol-2-ylidene andbis(pentamethylcyclopentadienyl)zinc shows a structure in which the zinc is only 
-bondedto the three ligating groups. Among the alkaline earth adducts, the -bonded interaction tothe former carbene center of the 1,3,4,5-tetramethylimidazol-2-ylidene shows the shortestmetal-carbon distances in each of the structures but the difference between the carbene-metal and pentamethylcyclopentadienyl-metal distances decreases as the atomic numberof the metal increases.
-bondedto the three ligating groups. Among the alkaline earth adducts, the -bonded interaction tothe former carbene center of the 1,3,4,5-tetramethylimidazol-2-ylidene shows the shortestmetal-carbon distances in each of the structures but the difference between the carbene-metal and pentamethylcyclopentadienyl-metal distances decreases as the atomic numberof the metal increases.