Room Temperature Defluorination of Poly(tetrafluoro)ethylene by a Magnesium Reagent

Abstract

Perfluoroalkyl substances (PFAS) are now pervasive in the environment. The largest single use material within the PFAS compound class is poly(tetrafluoro)ethylene) (PTFE), a robust and chemically resistant polymer. Despite their widespread use and serious concerns about their role as pollutants, methods for repurposing PFAS are rare. Here we show that a nucleophilic magnesium reagent reacts with PTFE at room temperature, generating a molecular magnesium fluoride which is easily separated from the surface-modified polymer. The fluoride in turn can be used to transfer the fluorine atoms to a small array of compounds. This proof-of-concept study demonstrates that the atomic fluorine content of PTFE can be harvested and re-used in chemical synthesis.

Mechanochemical synthesis, characterization and reactivity of a room temperature stable calcium electride

“…2 Sub-valent Mg(I) complexes have established themselves as soluble reducing agents, which can be employed effectively against a variety of substrates and small molecules. [3][4][5] Despite these successes, attempts to extend the same methodologies to the heavier congeners (Ca-Ba) have not been successful due to the synthetic challenges associated with these species (e.g. Schlenk equilibrium, large ionic radii, electropositive character, solubility).…”