19781-30-7Relevant academic research and scientific papers
Decene formation in ethylene trimerization reaction catalyzed by Cr-pyrrole system
Zilbershtein, Timur M.,Kardash, Vladislav A.,Suvorova, Vladlena V.,Golovko, Anatoly K.
, p. 371 - 378 (2014)
Decene formation in the ethylene trimerization reaction was studied using a chromium(III) 2-ethylhexanoate/2,5-dimethylpyrrole/triethylaluminum/ diethylaluminum chloride catalyst system. Kinetic investigations revealed that some decene formation reactions did not depend on 1-hexene concentration, because 1-hexene and catalyst may react with ethylene before dissociation of 1-hexene-catalyst complex after 1-hexene formation. The results demonstrated that decene formation is an intrinsic part of the trimerization reaction mechanism. It was also shown that a stepwise elimination mechanism for the decomposition of the chromacycloheptane intermediate cannot explain the observed product distribution. The dependencies found allow selection of appropriate conditions for low or high decene formation in the ethylene trimerization reaction.
Elongation and branching of a-olefins by two ethylene molecules
Dietel, Thomas,Lukas, Fabian,Kretschmer, Winfried P.,Kempe, Rhett
, p. 1021 - 1024 (2022/03/15)
a-Olefins are important starting materials for the production of plastics, pharmaceuticals, and fine and bulk chemicals. However, the selective synthesis of a-olefins from ethylene, a highly abundant and inexpensive feedstock, is restricted, and thus a broadly applicable selective a-olefin synthesis using ethylene is highly desirable. Here, we report the catalytic reaction of an a-olefin with two ethylene molecules. The first ethylene molecule forms a 4-ethyl branch and the second a new terminal carbon-carbon double bond (C2 elongation). The key to this reaction is the development of a highly active and stable molecular titanium catalyst that undergoes extremely fast b-hydride elimination and transfer.
