- Selbstimmobilisierende Metallocenkatalysatoren
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A novel method for the preparation of heterogeneous metallocene catalysts is described that can be applied for the polymerization of olefins starting with homogeneous metallocene complexes. For this purpose zirconocene dichloride complexes have been prepared containing alkenyl or alkynyl substituents. These complexes can be activated with methyl alumoxane (MAO) and then are incorporated as comonomers into the formed polyolefin chain. The homogeneous metallocene catalysts become self-immobilizing under the reaction conditions and the further formation of the polyolefin is then catalyzed heterogeneously.
- Peifer, Bernd,Milius, Wolfgang,Alt, Helmut G.
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Read Online
- Mild niobium-catalyzed [2 + 2 + 2] cycloaddition of sila-triynes: Easy access to polysubstituted benzosilacyclobutenes
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A new and efficient synthesis of highly sensitive benzosilacyclobutenes has been developed. For the first time, these compounds can be synthesized in very high yields by a mild, unprecedented intramolecular niobium-catalyzed [2 + 2 + 2] cycloaddition of easily accessible tetrasubstituted sila-triynes. An easy access to highly functionalized benzosilacyclobutenes enlarging the number of potential applications in organic and material chemistry is described.
- Simon, Cdric,Amatore, Muriel,Aubert, Corinne,Petit, Marc
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supporting information
p. 844 - 847
(2015/06/01)
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- Effect of ether on regioselectivity in hydrosilylation of 1,5-hexadiene with chlorohydrosilanes catalyzed by homogeneous platinum catalysts
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Hydrosilylation of 1,5-hexadiene with chlorohydrosilanes catalyzed by homogeneous platinum catalyst to produce 5-hexenylchlorosilanes was studied. The presence of ether additives was highly effective in improving the regioselectivity and the yield. The formation of a double-bond rearrangement isomer, cis-, or trans-4-hexenylchlorosilanes, during the hydrosilylation was reduced drastically, as well. Copyright Taylor & Francis Group, LLC.
- Saiki, Takeaki
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experimental part
p. 1556 - 1563
(2009/10/14)
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- PREPARATION OF A HALOSILYLATED CHAIN HYDROCARBON
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A method for the preparation of a chain hydrocarbon halosilylated at its terminal carbon atom or terminal carbon atoms by subjecting a diene-type compound and a hydrogenhalosilane to a hydrosilylation reaction in the presence of a hydrosilylation catalyst and an ether compound having no aliphatic triple bond.A method of conducting a hydrosilylation reaction between a diene-type compound that has vinyl groups on both terminals and a hydrogenhalosilane in the presence of a hydrosilylation catalyst and an ether compound having no aliphatic triple bond.
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Page/Page column 23-24
(2008/06/13)
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