Valorisation of plastic waste via metal-catalysed depolymerisation

• Francesca Liguori,
• Carmen Moreno-Marrodán and
• Pierluigi Barbaro

Beilstein J. Org. Chem. 2021, 17, 589–621, doi:10.3762/bjoc.17.53

Surprisingly facile CO₂ insertion into cobalt alkoxide bonds: A theoretical investigation

• Willem K. Offermans,
• Claudia Bizzarri,
• Walter Leitner and
• Thomas E. Müller

Beilstein J. Org. Chem. 2015, 11, 1340–1351, doi:10.3762/bjoc.11.144

• explored in several studies. Rieger et al. studied the mechanisms of the copolymerisation by homogeneous chromium(III)– and aluminium(III)–salen complexes and by heterogeneous zinc-dicarboxylates [30][31]. Experimental work on the chromium(III)– and aluminium(III)–salen complexes was combined with a

• theoretical study, in which the initiation and propagation steps of the copolymerisation were addressed. The initiation started with the coordination of epoxide at a penta-coordinated metal–salen complex, followed by a nucleophilic, SN2-like, back-side attack on such a coordinated epoxide. The propagation

• considerable energy, and it was concluded to be the rate-determining step especially at low CO2 concentrations. A mechanism for the copolymerisation of epoxides and CO2, catalysed by cobalt(III)–salen complexes was proposed by Lu et al. [32]. The authors stated that a general mechanism with pending (re

CO₂ Chemistry

• Thomas E. Müller and
• Walter Leitner

Beilstein J. Org. Chem. 2015, 11, 675–677, doi:10.3762/bjoc.11.76

• ]. Activation of carbon dioxide by inserting it into metal-alkoxide bonds allows for subsequent applications in polymer synthesis such as the copolymerisation of carbon dioxide with epoxides and other co-monomers [11]. Here, the catalysis with cobalt complexes still presents surprising effects [12]. More

Anion effect controlling the selectivity in the zinc-catalysed copolymerisation of CO₂ and cyclohexene oxide

• Sait Elmas,
• Muhammad Afzal Subhani,
• Walter Leitner and
• Thomas E. Müller

Beilstein J. Org. Chem. 2015, 11, 42–49, doi:10.3762/bjoc.11.7

• Chemie, RWTH Aachen University, Worringerweg 1, D-52074 Aachen, Germany 10.3762/bjoc.11.7 Abstract The choice of the anion has a surprisingly strong effect on the incorporation of CO2 into the polymer obtained during the zinc-catalysed copolymerisation of CO2 and cyclohexene oxide. The product span

• copolymerisation reaction. Keywords: anion effect; carbon dioxide; CO2 chemistry; copolymerisation; polyethercarbonate; zinc catalyst; Introduction The fixation of carbon dioxide (CO2) into polymers [1][2][3] provides highly promising options for the utilization of CO2 [4][5][6][7]. The copolymerisation of CO2

• heterogeneous catalysts are known to catalyse the copolymerisation reaction [5][11][12][13]. One lead structure (Scheme 1) for catalysing the reaction is based on binuclear complexes with a macrocyclic ligand framework (Type I) [14][15][16]. The macrocyclic ligand L is a 22-membered Robson-type ligand with four