Patent ID: 8877937
Filing Date: 2014-11-04
Classification: B01J,C07F

Abstract:
1. A process for preparing a cyclometallated carbene complex of the general formula (1) comprising at least one carbene ligand where the symbols have the following meanings: M carbene is a carbene ligand selected from the group consisting of carbene ligands a-j: where the symbols have the following meanings: Z, Z′, Z″ are identical or different and are each CH or N; R t and t′ are identical or different and are each from 0 to 4, where, when t or t′ is >1, the radicals R R R R with the group of the structure also being able to be joined via the aromatic basic skeleton or via one of the radicals R 12 to R 4 or R 5 or the carbon atom to which R 4 and R 5 are bound in the groups a and f, R 8 or the carbon atom to which R 8 is bound in the groups b and g, one of the radicals R 10 or one of the carbon atoms to which R 10 is bound in the groups c and h and R 11 or the carbon atom to which R 11 is bound in the groups d and i via a bridge which can have the following meanings: alkylene, arylene, heteroarylene, alkynylene, alkenylene, NR 18 , PR 19 , BR 20 , O, S, SO, SO 2 , SiR 30 R 31 , CO, CO—O, O—CO and (CR 21 R 22 ) x , where one or more nonadjacent (CR 21 R 22 ) groups may be replaced by NR 18 , PR 19 , BR 20 , O, S, SO, SO 2 , SiR 30 R 31 , CO, CO—O, O—CO, where x is from 2 to 10; and R where in the cases in which the group of the structure is linked via a bridge to the carbon atom to which R v is from 0 to 4, where, when v is 0, the four carbon atoms of the aryl radical in formulae c and h which may optionally be substituted by R Y L is a monoanionic or dianionic ligand which may be monodentate or bidentate; K is an uncharged monodentate or bidentate ligand; n is the number of carbene ligands, with n being at least 1, and the carbene ligands in the complex of the formula I being able to be identical or different in the case of n>1; m is the number of ligands L, with m being able to be 0 or ≧1 and the ligands L being able to be identical or different in the case of m>1; o is the number of ligands K, with o being able to be 0 or ≧1 and the ligands K being able to be identical or different in the case of o>1; where the sum n+m+o is dependent on the oxidation state and coordination number of the metal atom used and on the denticity of the ligands carbene, L and K and also on the charge on the ligands carbene and L, with the proviso that n is at least 1; which comprises reaction of a ligand precursor selected from the group consisting of ligand precursors a′-j′: where Q and the further symbols in formulae a′-j′ have the meanings given in respect of carbene ligands a-j, wherein the reaction comprises the use of a base and an auxiliary reagent selected from among salts of Ag, Hg, Sb, Mg, B and Al (route A) and the ligand precursor selected from the group consisting of ligand precursors a′-j′ is (A) reacted with the base, a metal complex comprising at least one metal M to give a cyclometallated carbene complex of the formula I.