Selectfluor, a trademark of Air Products and Chemicals, is a reagent in chemistry that is used as a fluorine donor.

The resulting salt is treated with elemental fluorine and sodium tetrafluoroborate:[2] The cation is often depicted with one skewed ethylene ((CH2)2) group.

[2] By using a charge-spin separated probe,[3] it was possible to show that the electrophilic fluorination of stilbenes with Selectfluor proceeds through an SET/fluorine atom transfer mechanism.

It is mainly used in the synthesis of organofluorine compounds:[2] Selectfluor reagent also serves as a strong oxidant, a property that is useful in other reactions in organic chemistry.

As applied to electrophilic iodination, Selectfluor reagent activates the I–I bond in I2 molecule.