Well‐defined Cp*Co(III)‐catalyzed Hydrogenation of Carbonates and Polycarbonates. Issue 3 (14th December 2020)

• Record Type: Journal Article
• Authors: Dahiya, Pardeep; Gangwar, Manoj Kumar; Sundararaju, Basker
• Is Part Of: ChemCatChem. Volume 13:Issue 3(2021)
• Page Start: 934
• Page End: 939
• Publication Date: 2020-12-14
• Subjects: Depolymerization -- Waste recycling -- Cobalt -- Carbonates -- Hydrogenation; Catalysis -- Periodicals; 541.39505
• DOI: 10.1002/cctc.202001490
• Languages: English
• ISSNs: 1867-3880

Abstract

Abstract: 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 i PrOH 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. Abstract : About chemical recycling : We herein demonstrate an efficient conversion of polycarbonates and carbonates into monomer/diol using well‐defined, high‐valent Cp*Co(III)‐catalytic system. Commercially available polymer as well as compact disc (CD) converted into monomer through hydrogenation using molecular hydrogen.