Transition metal complexes comprising a diaminocarben ligand and their use in transition metal catalysed reactions

摘要

Transition metal complexes with diaminocarbene ligands are new. ??Compounds of formula (I) are new. ??M = Sub-Group 6-8 metal; ??R1-R4 = H or linear, branched or cyclic hydrocarbyl selected from 1-50C alkyl, 2-50C alkenyl or alkynyl, or 6-30C aryl (all optionally substituted with functional group(s)); ??L = Neutral 2-electron donor ligands and/or part of a cyclic system and/or anionic ligands; ??n = Integer. ??R1 and R2 and/or R3 and R4 may form part of a ring system with 2-20 C atoms and one N atom (not including the carbons in the R groups; optionally with at least one ring H replaced by a functional group and/or with at least one ring C replaced by S, P, O or N), and/or R1 and/or R2 and/or R3 and/or R4 may be linked with one of the ligands L by a bridging group with 1-20 C atoms (not including those in the R groups). ??Independent claims are also included for: ??(1) Method for the production of (I) by preparation of a carbene ligand of formula (Ia) by deprotonation of a formamidinium salt with strong base or by the ammonia method, followed by a ligand-exchange reaction between (II) and suitable transition metal complexes; and ??(2) Methods for the production of (I) by reacting compounds of formula (Ib) with transition metal complexes (salt metathesis), or by reacting these compounds with alkali metal alcoholates and then subjecting the resulting alcoholate adduct to ligand exchange with a transition metal complex.