Synthesis of dialkyl adducts of activated olefins and dienes
作者:A. Davis、M. H. Morgan、D. H. Richards、N. F. Scilly
DOI:10.1039/p19720000286
日期:——
A number of dialkyladducts (phenylalkanes and olefins) of vinyl monomers and dienes have been prepared from the reactions of monomers with lithium and alkyl bromides in tetrahydrofuran. The n.m.r. spectra of the products are reported.
Synthesis of Farnesol Analogues through Cu(I)-Mediated Displacements of Allylic THP Ethers by Grignard Reagents
作者:Mark F. Mechelke、David F. Wiemer
DOI:10.1021/jo990161p
日期:1999.6.1
The synthesis of a family of farnesol analogues, incorporating aromatic rings, has been achieved in high yields through the development of a regioselective coupling of allylic tetrahydropyranyl ethers with organometallic reagents. The allylic THP group is displaced readily by Grignardreagents in the presence of Cu(I) halides but is stable in the absence of added copper. Thus, an allylic THP group
Mechanistic Studies of Ethylene and α-Olefin Co-Oligomerization Catalyzed by Chromium–PNP Complexes
作者:Loi H. Do、Jay A. Labinger、John E. Bercaw
DOI:10.1021/om300492r
日期:2012.7.23
chromatographic and massspectrometric analyses, strongly support a mechanism that involves five- and seven-membered metallacyclic intermediates comprised of ethylene and LAO units. Using 1-heptene as a mechanistic probe, it was established that 1-hexene formation from ethylene is competitive with formation of ethylene/LAO cotrimers and that cotrimers derived from one ethylene and two LAO molecules
为了探索从乙烯作为化学原料生产窄分布的中长链烃的可能性,使用先前报道的铬络合物 [CrCl 3 (PNP OMe )]( 1,其中 PNP OMe = N,N-双(双(邻-甲氧基苯基)膦基)甲胺)。在乙烯和 1-己烯存在下,通过用改性甲基铝氧烷 (MMAO) 处理活化1,主要提供 C 6和 C 10烯烃产物。C 10的身份通过详细的气相色谱和质谱分析指定的异构体强烈支持涉及由乙烯和 LAO 单元组成的五元和七元金属环中间体的机制。使用 1-庚烯作为机制探针,确定由乙烯形成的 1-己烯与乙烯/LAO 共三聚体的形成具有竞争性,并且还生成了衍生自一个乙烯和两个 LAO 分子的共三聚体。Complex 1/ MMAO 也能够将 1-己烯转化为 C 12二聚体和 C 18三聚体,尽管效率很低。讨论了这些研究的机械意义,并与之前的烯烃共三聚报道进行了比较。
Effect of an additional donor on decene formation in ethylene oligomerization catalyzed by a Cr/PCCP system: a combined experimental and DFT study
Cr catalyst based on a PCCP ligand shows high activity in ethylene oligomerization, giving 1-hexene and considerable C10 fraction. DFT calculation results are consistent with the experimental observations on the distribution of C10 isomers.