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A new immobilization scheme for enantioselective catalysts was developed by using a combination of ionic liquids and compressed CO2. Under continuous flow conditions, stable conversion and asymmetric induction was achieved over more than 60 h in the enantioselective Ni-catalyzed hydrovinylation of styrene. While the ionic liquid dissolves and activates the organometallic catalyst in a tuneable manner, the presence of compressed CO2 greatly facilitates mass transfer and gives easy access to continuous processes (see the schematic representation).
Bösmann et al. (2001) studied this question.
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