XtalFluor-E: A useful and versatile reagent in organic transformations

XtalFluor-E, [Et 2 NSF 2 ]BF 4 , is best known as a useful, versatile and inexpensive commercially available reagent for the deoxyfluorination of carbonyl compounds and alcohols. Although XtalFluor-E is commonly used in combination with an exogenous fluoride source as a deoxofluorinating reagent, it has also been widely employed in other chemical transformations such as dehydration, cyclodehydration , ring expansion, formylation , and proto-functionalization, etc. This Review aims to provide an overview for the applications of XtalFluor-E as a reagent in organic synthesis, including its physical properties, futures, and its unique roles beyond than being just as a deoxofluorinating reagent in organic transformation.