Formation and synthetic utility of benzyl- and phenyl-cyclopentadienylthallium
作者:Poonam Singh、Marvin D. Rausch、Thomas E. Bitterwolf
DOI:10.1016/0022-328x(88)83116-4
日期:1988.9
Benzyl- and phenyl-cyclopentadiene have been shown to react with thallium ethoxide in ethanol to give the corresponding benzyl- and phenyl-cyclopentadienylthallium compounds in excellent yields. These reagents are air stable for brief periods, have extended shelf-lives, and have been shown to be superior starting materials for the synthesis of a variety of cyclopentadienylmetal complexes.
suitably substituted norbornenes which can lead to the required cyclopentadiene and an aromatic fragment by a retro-Diels–Alder reaction. In one series the intermediate was a phenyl azide adduct of norbornadiene which fragmented to cyclopentadiene and phenyltriazole, but the temperature required for this was clearly too high to allow substituted cyclopentadienes to be isolated before they had rearranged. In
Zirconocene-catalyzed dimerization of 1-hexene: Two-stage activation and structure–catalytic performance relationship
作者:Ilya E. Nifant'ev、Alexey A. Vinogradov、Alexander A. Vinogradov、Pavel V. Ivchenko
DOI:10.1016/j.catcom.2016.02.013
日期:2016.4
The dimerization of 1-hexene was catalyzed by ten zirconocenes. High catalytic productivity was achieved via a two-step activation process, namely, the treatment of the zirconocene with triisobutylaluminum (TIBA) followed by methylaluminoxane (MAO). The zirconocene [(C5H4SiMe2)2O]ZrCl2 (10) exhibits a higher productivity and selectivity to dimer formation than the unsubstituted (C5H5)2ZrCl2 (1) complex
1-己烯的二聚反应被十种茂茂金属催化。通过两步活化过程,即先用三异丁基铝(TIBA)然后用甲基铝氧烷(MAO)处理锆茂,实现了高催化生产率。锆茂[[C 5 H 4 SiMe 2)2 O] ZrCl 2(10)与未取代的(C 5 H 5)2 ZrCl 2(1)配合物相比,具有更高的生产率和对二聚体形成的选择性。对于ansa- [Z(C 5 H 4)2 ] ZrCl 2配合物,催化活性随环戊二烯基环之间的角度减小而增加。当使用Et 2 AlCl作为形成催化物质所需的氯源进行反应时,二聚选择性10达到94%。讨论了选择性α-烯烃二聚的可能机理。