Abstract
Arylboron compounds with electron-withdrawing substituents at their aryl groups are water tolerant Lewis acid catalysts for various carbon-carbon bond formation reactions. For examples, tris (pentafluorophenyl)boron catalyzes aldol-type reaction of aldehydes and imines with silyl enol ethers, stereoselective rearrangement of epoxides, hydrosilation of carbonyl compounds, etc. 3, 4, 5-Trifluorophenylboronic acid promotes amidation reaction between carboxylic acids and amines. Bis (pentafluorophenyl) borinic acid catalyzes substrate selective dehydration reaction of anti-aldols, and Oppenauer oxidation of allylic, and benzylic alcohols.
