Acyl anion equivalents generated in situ from thiazolium salts in the presence of a fluoride source can be successfully utilized as Umpolung nucleophilic agents. These easy to prepare reagents formed in the absence of amine bases are compatible with several base sensitive electrophiles including nitroalkenes, o-quinone methides and aliphatic aldehydes. The thiazolium carbinol salts are bench stable and generated from the corresponding aldehydes in three simple steps.  The scope, limitations and application of this new strategy will be presented.