Air Stable N‐Heterocyclic Carbene‐Carbodiimide ("NHC‐CDI") Adducts: Zwitterionic Type Bulky Amidinates. Issue 3 (15th March 2016) - Baishya, Ashim
Abstract: Herein we report a library of N‐heterocyclic carbene‐carbodiimide ("NHC‐CDI") adducts i. e., zwitterionic type amidinates from the reaction between N, N' ‐diaryl substituted symmetrical or unsymmetrical carbodiimide and N‐heterocyclic carbene at room temperature conditions. Generally, normal amidinates are air and moisture sensitive; that can be achieved by the treatment of amidines with base under air and moisture free conditions. In contrast, these new zwitterionic type bulky amidinate compounds are neutral and air stable. All new 31 examples of "NHC‐CDI" adducts were characterized by 1 H, 13 C{ 1 H} and HRMS analyses. Further, six compounds were confirmed by single crystal X‐ray structural analysis. Abstract : Bulky amidinates can be readily prepared by the reaction of unsaturated N‐heterocyclic carbenes with N, N' ‐diaryl substituted symmetrical and unsymmetrical carbodiimides. These are air stable and zwitterionic type ligands. These "NHC‐CDI" adducts might be alternatives to well known neutral NHC ligand systems. They have the potential to precursors for the construction of metal complexes across the periodic table.