Journal
CATALYSIS SCIENCE & TECHNOLOGY
Volume 3, Issue 10, Pages 2661-2667Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3cy00325f
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Funding
- CSIR-SRF fellowship
- CSIR, New Delhi, India
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Bifunctional polymeric Co(III) salen complexes 1a-g derived from (1R,2R)-(-)-1,2-diaminocyclohexane and a triazine-piperazine core were synthesized and screened for the asymmetric cycloaddition reaction of CO2 and an epoxide under mild conditions. A moderate K-rel value of 11.2 for the product propylene carbonate (ee = 74%) was obtained with catalyst 1e which does not require any external base as the co-catalyst. The polymeric Co(III)-CCl3COO (1e) was efficiently recycled 10 times without any significant loss in activity under the present reaction conditions.
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