Journal
CHEMCATCHEM
Volume 13, Issue 3, Pages 934-939Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cctc.202001490
Keywords
Depolymerization; Waste recycling; Cobalt; Carbonates; Hydrogenation
Categories
Funding
- CEFIPRA [IF-5805-1]
- CSIR
- SERB
- PK Kelkar Young Faculty Award
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By utilizing high-valent cobalt complexes, carbonates and polycarbonates have been successfully catalytically hydrogenated into diols/alcohols, with the synthesis of novel Cp*Co(III) complexes. This method demonstrates excellent catalytic activity and the ability to recycle bisphenol A monomer from waste CDs.
We herein report the catalytic hydrogenation of carbonates and polycarbonates into their corresponding diols/alcohols using well-defined, air-stable, high-valent cobalt complexes. Several novel Cp*Co(III) complexes bearing N,O-chelation were isolated for the first time and structurally characterized by various spectroscopic techniques including single crystal X-ray crystallography. These novel Co(III) complexes have shown excellent catalytic activity to produce value added diols/alcohols from carbonate and polycarbonates through hydrogenation using molecular hydrogen as sole reductant or (PrOH)-Pr-i as transfer hydrogenation source. To demonstrate the developed methodology's practical applicability, we have recycled the bisphenol A monomer from compact disc (CD) through hydrogenation under the established reaction conditions using phosphine-free, earth-abundant, air- and moisture-stable high-valent cobalt catalysts.
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