catalysis; olefins; radicals and radical reactions; ruthenium and compounds
Abstract :
[en] The catalytic activity of ruthenium-p-cymene complexes bearing N-heterocyclic carbene ligands in atom transfer radical addition (ATRA) or polymerisation (ATRP) strongly depends on the substituents of the carbene ligand, thereby providing a nice illustration of the importance of organometallic engineering and ligand fine tuning in homogeneous catalysis. (C) 2003 Elsevier Ltd. All rights reserved.
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Preliminary investigations showed that the reaction of 1,3-dicyclohexylimidazol-2-ylidene with 2 equiv. of CCl4 in THF afforded a mixture of 1,3-dicyclohexyl-2-chloroimidazolium chloride and another yet unidentified product instead of the expected 4,5-dichloro-1,3-dicyclohexylimidazol-2-ylidene.
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In these data processings, both initial styrene concentrations [M]0 and styrene conversions were corrected to exclude the fraction of substrate converted into stilbenes through the metathesis process.