The reusability of these heterogeneous magnetic nanoparticles
was also examined for the anti-Markovnikov
addition of thiophenol to styrene under the same reaction
conditions. The magnetic Fe3O4 nanoparticles were
adsorbed onto the magnetic stirring bar when the magnetic
stirring was stopped. The nanoparticles were then washed
with ethanol, air-dried and used directly for the next run of
the reaction without further purification. We observed that
the catalytic activity of the catalyst was restored within the
limits of the experimental errors for eight successive runs
as presented in Fig. 1.