Coupling of CO2 and epoxides catalysed by novel N-fused mesoionic carbene complexes of nickel (II)

We report the syntheses of two rigid mesoionic carbene (MIC) ligands with a carbazole backbone via an intramolecular Finkelstein cyclisation cascade and investigate their coordination behavior towards nickel(s) acetate. Despite the nickel(s) carbene complexes 4a,b showing only minor differences in their chemical composition, they display curious differences in their chemical properties, e.g. solubility. Furthermore, the potential of these novel MIC complexes in the coupling of carbon dioxide and epoxides as well as the differences in reactivity compared to classical NHC-derived complexes are evaluated.

Automated summary

Two rigid mesoionic carbene (MIC) ligands were synthesized via intramolecular Finkelstein cyclisation, and their coordination behavior towards nickel(s) acetate was investigated. Despite minor differences in chemical composition, the nickel(s) carbene complexes showed curious differences in chemical properties, and their potential in coupling reactions was evaluated.