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the diffusion coefficient for Ni(II) salen in ionic
liquid [bmim]BF 4 at room temperature is 1.8 ×
10 −8 cm 2 s −1 , which is more than 500 times
smaller than that in a typical organic
solvent-electrolyte system like 0.1 M
Et 4 NClO 4 /DMF [36].
6.8.6 Organic Electrochemical
Reactions in Ionic Liquids
Although ionic liquids are considered to be an
ideal medium for organic electrolytic reactions
because of their non-flammability and sufficient
electroconductivity as well as wide potential
windows, there have not yet been many reports
of organic electrochemical reactions in ionic
liquids.
6.8.6.1 Organic Electrosynthesis
Cathodic reduction of carbonyl compounds like
benzaldehyde and acetophenone has been
investigated in ionic liquids, and notably their
dimerization proceeded predominantly [37,38].
For acetophenone, the corresponding pinacol
was formed as a diastereomeric mixture, and
the diastereoselectivity is greatly affected by the
ionic liquids used, as shown in Eq. 6.9 [37]. As a
solvent, aliphatic ionic liquids result in higher
diastereoselectivity compared to aromatic ionic
liquids.
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