With these structural requirements in mind, we embarked on the synthesis of a series of Lewis acidic triaryl-boranes 4a–d endowed with the same steric bulk around the boron atom.

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† Department of Chemical Engineering, IIT Kharagpur, Kharagpur, West Bengal 721302, India ‡ Department of Chemical Engineering, IESI, Indore 452012, India § Department of Chemistry, NIT Raipur, Raipur ...