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The first example of a Cu-catalysed borylation of a wide range of aryl chlorides with different electronic and steric properties is mediated by a readily prepared NHC-stabilised Cu catalyst and KO t Bu. The aryl chlorides are converted into their corresponding arylboronic esters using B 2 pin 2 or B 2 neop 2 as the boron reagent.
Kuehn et al. (Tue,) studied this question.