Abstract
Rasta resin-DMAP, a new heterogeneous polystyrene-based amine,
has been synthesized and used as a catalyst in addition reactions
of carbon dioxide to epoxides to afford cyclic carbonate products.
This new material was found to be a more efficient catalyst than
divinyl benzene cross-linked polystyrene-supported DMAP, and was
readily recovered and reused without significant loss of catalytic
activity.
Key words
polymer-supported organocatalyst - polystyrene - DMAP - carbon dioxide - cyclic carbonate
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General Procedure
for CO
2
Addition
Reactions
Epoxide 7a -j (22.4 mmol), CH2 Cl2 (0.5
mmol), and 4 (0.224 mmol) were placed in
a 25 mL stainless-steel autoclave. Carbon dioxide was then introduced
into the reactor at an initial pressure of 20 bar at r.t. The reactor
was then heated to 120 ˚C, and the pressure was
adjusted to 30 bar. The reaction mixture was stirred under these
conditions for the indicated time, and then the autoclave was cooled
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