Synthesis of sterically hindered N-benzyladamantyl substituted benzimidazol-2-ylidene palladium complexes and investigation of their catalytic activity in aqueous medium

NHC-Pd-PEPPSI complexes with bulky benzyladamantyl substituted N-heterocyclic carbenes (NHC) were synthesized and characterized by NMR, HRMS, and micro analysis. These complexes were then used for Suzuki-Miyaura coupling reactions between aryl bromides and phenylboronic acid. With low catalyst loading, all synthesized complexes rapidly catalyzed the Suzuki-Miyaura cross-coupling reaction in i-PrOH/water (1:3 v/v) at room temperature in air. All palladium compounds were stable and had high catalytic activity for the Suzuki-Miyaura coupling reaction.

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