Divergent methods for polyester and polycarbonate depolymerization with a cobalt catalyst

Abstract

Catalytic methods for the cyclodepolymerization and solvolysis of polyesters and polycarbonates have been realized with a molecular cobalt catalyst. Nascent strategies to modify these methods for use in mixed plastic waste streams are identified.

Homo- to Co-Polyester Conversion in the Absence of Reagents Fa-cilitated by a Dual Catalytic Process Involving Hydrogen Borrowing

“…Recent advancements of such metal-ligand-cooperative catalysis particularly involve hydrogenation, dehydrogenation and dehydrogenative coupling reactions as well as hydrogen borrowing-type reactions. 1,2,[11][12][13][3][4][5][6][7][8][9][10] These important developments were also applied for the synthesis of polyesters [14][15][16] and -amides [17][18][19][20] by dehydrogenative coupling, as well as for alternative strategies for the recycling of polyester, [21][22][23][24] -amides 25,26 and -urethanes 26 by hydrogenation (Fig. 1 A), but the huge number of catalytic hydrogen borrowing type protocols in organic synthesis have never been applied to polymers (Fig.…”

Homo- to Co-Polyester Conversion in the Absence of Reagents Fa-cilitated by a Dual Catalytic Process Involving Hydrogen Borrowing

“…Recent advancements of such metal-ligand-cooperative catalysis particularly involve hydrogenation, dehydrogenation and dehydrogenative coupling reactions as well as hydrogen borrowing-type reactions. 1,2,[11][12][13][3][4][5][6][7][8][9][10] These important developments were also applied for the synthesis of polyesters [14][15][16] and -amides [17][18][19][20] by dehydrogenative coupling, as well as for alternative strategies for the recycling of polyester, [21][22][23][24] -amides 25,26 and -urethanes 26 by hydrogenation (Fig. 1 A), but the huge number of catalytic hydrogen borrowing type protocols in organic synthesis have never been applied to polymers (Fig.…”