Abstract

Abstract Arylboron reagents with electron-withdrawing aromatic groups and chiral boron reagents as Lewis acid catalysts are described in this chapter. The classical boron Lewis acids, BX3, RBX2 and R2BX (X = F, Cl, Br, OTf) have become popular tools in organic synthesis. In general, these are used stoichiometrically in organic transformations under anhydrous conditions, since the presence of even a small amount of water causes rapid decomposition or deactivation of the promoters. To obviate some of these inherent problems, we have demonstrated the potential of tris(pentafluorophenyl)boron (1), bis(pentafluorophenyl)borinic acid (2), bis(3,5-bis(trifluoromethyl)phenyl) borinic acid (3), 3,4,5-trifluorophenylboronic acid (4), and 3,5-bis(trifluoro methyl)phenylboronic acid (5) as a new class of boron catalysts.

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