Palladium-mediated intramolecular acylation reaction in the attempted phosphinylation of a sterically hindered trifluoromethylsulfonyloxybiaryl carboxylic ester†
Abstract
The unexpected palladium-assisted cyclization reaction of a sterically hindered o-methoxycarbonyl-o′-trifluoromethyl- sulfonyloxybiaryl gives fluorenone 4, via intramolecular acylation instead of the attempted phosphinylation.