Abstract: The invention relates to novel immobilisable imidazolium salts of the general formulae (I) and (II) which contain a group R carrying SiR?n(OR?)3?n on one of the two nitrogen atoms and a sterically demanding cyclic hydrocarbon radical on the other of the two nitrogen atoms of the heterocyclic ring. The invention furthermore relates to the use of the compounds of the general formulae (I) and (II) as starting materials for immobilisable catalyst ligands, catalyst precursors and catalysts, and to the use as solvents in organic, organometallic and transition metal-catalysed synthesis and as catalysts in organic synthesis.

Abstract: The invention relates to the process for the preparation of N,N-disubstituted imidazolium salts, N-heterocyclic carbene ligands and ruthenium catalysts containing N-heterocyclic carbene ligands, i.e. compounds of the general formulae (I) and, (II), compounds of the general formulae (III) and (IV) and compounds of the general formulae (V) and (VI), immobilised on inorganic oxide supports. The invention furthermore relates to the use of the immobilised compounds of the general formulae (I-IV) in organic, organometallic or transition metal-catalysed synthesis and to the use of the compounds of the general formulae (V) and (VI) as catalysts in organic and organometallic synthesis, in particular for C—C coupling reactions, such as olefin metathesis.

Abstract: The invention relates to immobilisable ruthenium catalysts containing N-heterocyclic carbene ligands of the general formulae (I) and (II) which contain an SiR?n(OR?)3 -carrying group on one of the two nitrogen atoms of the NHC ligand, and to the use thereof as homogeneous catalysts in C-C coupling reactions, in particular olefin metathesis. The invention furthermore relates to the use of the compounds as starting materials for the preparation of analogous immobilised ruthenium catalysts containing N-heterocyclic carbene ligands.

Abstract: The invention relates to immobilisable N-heterocyclic carbenes of the general formulae (I) and (II) which contain an SiR?n(OR?)3-n-carrying group on one of the two nitrogen atoms of the heterocyclic ring. The invention furthermore relates to the use of the compounds as ligands for immobilisable and immobilised catalysts.