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in ordinary molecular solvents since the
Co(II)salen complex remains in the ionic liquid
phase during product extraction with non-polar
organic solvents like diethyl ether.
Furthermore, the recyclability of the catalyst/
ionic liquid system was demonstrated.
(6.11)
Cyclic carbonates are prepared by the reduction
of CO
2
at −2.4 V vs. Ag/AgCl in the presence of
epoxides in various ionic liquids like
[emim]BF
4
, [bmim]PF
6
and [BPy]BF
4
(BPy=
n
-butylpyridinium) using a Cu cathode
and a Mg or Al anode [42].
Electrochemical synthesis of carbamates was
also achieved by the electrolysis of a solution of
CO
2
and amine in [bmim]BF
4
followed by the
addition of alkylating agent, as shown in
Eq.
6.12
[43].
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