of noble metal catalysts in homogeneouscatalysis has been well established. Due to their price and limited availability, there is growing interest in the substitution of such precious metal complexes with readily available and bio‐relevant catalysts. In particular, iron is a “rising star” in catalysis. Herein, we present a general and selective iron‐catalyzed monoisomerization of olefins, which allows
The present invention relates to a process for producing polyolefins wherein a feedstock comprising n-olefin or a mixture of n-olefins is dimerized in the presence of a solid acidic catalyst by passing the feedstock to a catalytic distillation apparatus comprising either a) a combination of a distillation column and a reactor comprising at least one catalyst bed, or b) a distillation column connected to one or more side reactors comprising at least one catalyst layer, recovering the unreacted n-olefin from the distillation column or the combination of the distillation column and the reactor at the upper part thereof as a side-stream to be combined with the feedstock, and the reaction product from the dimerization is hydrogenated.
SiO<sub>2</sub>-Supported Rh Catalyst for Efficient Hydrosilylation of Olefins Improved by Simultaneously Immobilized Tertiary Amines
作者:Ken Motokura、Kyogo Maeda、Wang-Jae Chun
DOI:10.1021/acscatal.7b01523
日期:2017.7.7
The simultaneous immobilization of a Rhcomplex and a tertiary amine on a SiO2 surface afforded a highly active supported catalyst for the hydrosilylation of terminalolefins. The turnover number in the reaction using 0.00005 mol % of the Rh catalyst approached 1 900 000 over 24 h. A broad range of terminalolefins and hydrosilanes acted as good substrates, giving their corresponding hydrosilylation
An Alternative Mechanism for the Cobalt-Catalyzed Isomerization of Terminal Alkenes to (<i>Z</i>)-2-Alkenes
作者:Anastasia Schmidt、Alexander R. Nödling、Gerhard Hilt
DOI:10.1002/anie.201409902
日期:2015.1.12
The cobalt‐catalyzed selective isomerization of terminal alkenes to the thermodynamically less‐stable (Z)‐2‐alkenes at ambient temperatures takes place by a new mechanism involving the transfer of a hydrogen atom from a Ph2PH ligand to the starting material and the formation of a phosphenium complex, which recycles the Ph2PH complex through a 1,2‐H shift.
A simple, mild elimination of hydrogen halide from primary alkyl bromides and iodides
作者:Sotiris Jeropoulos、Edward H. Smith
DOI:10.1039/c39860001621
日期:——
Addition of a solution of a primaryalkylbromide or iodide and 1,8-diazabicyclo[5.4.0]undec-7-ene in tetrahydrofuran (THF) to a solution prepared from dichlorobis(triphenylphosphine)nickel, triphenylphosphine, and n-butyl-lithium in THF results in an elimination at room temperature to give, in most cases, the terminal alkene.