A single step approach for the synthesis of non-symmetrical tetraaryl-α-diimines via the transimination route at room temperature was developed. The reported procedure was found to be an elegant route for making non-symmetrical tetraaryl-α-diimines, which upon cyclization yields a series of new non-symmetrical 1,3,4,5-tetraarylimidazolium chlorides, as stable N-heterocyclic carbene (NHC) precursors.
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