Hydrocarbonylation reactions using alkylphosphine-containing dendrimers based on a polyhedral oligosilsesquioxane core
作者:Loïc Ropartz、Douglas F. Foster、Russell E. Morris、Alexandra M. Z. Slawin、David J. Cole-Hamilton
DOI:10.1039/b200303a
日期:2002.4.26
oct-1-ene, non-1-ene, prop-1-en-2-ol) in polar solvents (ethanol or THF) using the complexes [Rh(acac)(CO)2] or [Rh2(O2CMe)4] as metal source. Linear to branched ratios up to 3 ∶ 1 for the alcohol products are obtained for the diethylphosphine dendrimers. The reactions were found to proceed mainly via the formation of the corresponding aldehydes.
Synthesis of highly functionalised dendrimers based on polyhedral silsesquioxane cores †
作者:Paul-Alain Jaffrès、Russell E. Morris
DOI:10.1039/a801510d
日期:——
A number of dendrimers based on polyhedral silsesquioxane cores have been synthesised and characterised. The new molecules are prepared by repetitive hydrosilation/alkenylation reactions, which provide a facile and high yield route to dendrimers with a high density of branch ends per generation. Judicious choice of hydrosilating agent [HSiCl3, H(CH3)SiCl2 or H(CH3)2SiCl] produces dendrimers with varying numbers of chain ends, and alkenylating agents of different lengths produce molecules with different physical properties. The 24-vinyl functionalised dendrimer, 5, has been characterised using single-crystal X-ray diffraction techniques.
我们合成了一些以多面体硅倍半氧烷为核心的树枝状聚合物,并对其进行了表征。新分子是通过重复的氢化/烯化反应制备的,这为每一代具有高密度分支末端的树枝状聚合物提供了一条简便、高产的途径。对水硅化剂[HSiCl3、H(CH3)SiCl2 或 H(CH3)2SiCl]的明智选择可制备出具有不同链端数量的树枝状聚合物,而不同长度的烯化剂可制备出具有不同物理性质的分子。使用单晶 X 射线衍射技术对 24-乙烯基官能化树枝状聚合物 5 进行了表征。
Increased selectivity in hydroformylation reactions using dendrimer based catalysts; a positive dendrimer effect
作者:Loïc Ropartz、Russell E. Morris、David J. Cole-Hamilton、Douglas F. Foster
DOI:10.1039/b009574p
日期:——
Dendrimers based on polyhedral oligomeric silsesquioxanes (POSS) cores with 16 PPh2 arms give much higher linear selectivities (14∶1) than their small molecule analogues (3–4∶1) in the hydroformylation of oct-1-ene.