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a sterically demanding unsymmetrical pentafluorophenyl - triisopropylphenyl-3-iodane was developed as an effective reagent for the electrophilic pentafluorophenylation of various -keto esters and a -keto amide . 
 17 examples of -pentafluorophenylated 1,3-dicarbonyl compounds 3 having a quaternary carbon center are provided . 
 the resulting compounds were nicely transformed into chiral -pentafluorophenyl ketones with an all - carbon stereogenic center in high yields and high enantioselectivities using asymmetric organocatalysis ( up to 98 % ee ) or asymmetric metal catalysis ( up to 82 % ee ) .