The organic nitroxyl
radical, TEMPO (2,2,6,6-tetramethylpiperidine-N-oxyl),
finds a variety of industrial applications for
chemical transformations. Because of economic and environmental concerns,
the recovery and reuse of TEMPO with maintained high activity are
of the utmost importance. In this Review, we summarize the most important
advances made by the scientific community in TEMPO immobilization
on various organic and inorganic support materials for recovery and
reuse, and we discuss the activity and stability, as well as the procedures.
Also summarized is the wide range of applications of TEMPO in both
homogeneous and heterogeneous forms in chemical transformations, beginning
from methodology tuning in synthetic chemistry to the use in polymer
chemistry.
A magnetically responsive Pickering interface biocatalytic system was used as an efficient platform for the separation and reuse of catalysts in biodiesel production.
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