Synthesis and characterization of transition metal amino-phenolate complexes and their reactivity towards the oxidation of lignin model compounds and cyclic carbonate formation

Elkurtehi, Ali I. (2017) Synthesis and characterization of transition metal amino-phenolate complexes and their reactivity towards the oxidation of lignin model compounds and cyclic carbonate formation. Doctoral (PhD) thesis, Memorial University of Newfoundland.

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Abstract

Vanadium and manganese complexes supported by amino-bis(phenolate) ligands, were synthesized and characterized. The catalytic activity of the vanadium complexes in the aerobic oxidation of 4-methoxybenzyl alcohol and 1,2-diphenyl-2-methoxyethanol was explored. Whereas, the complexes showed limited reactivity in H₂O₂-mediated oxidation of diphenylether and benzylphenylether. The manganese complexes showed low activity for the aerobic oxidation of 4-methyoxybenzylalcohol and 1,2-diphenyl-2- methoxyethanol. The catalytic synthesis of cyclic carbonates under solvent free conditions using vanadium and manganese complexes, epoxides and carbon dioxide was attempted and monitored by in situ IR and NMR spectroscopic techniques. Variable temperature kinetic studies were performed and the activation energies for cyclic carbonate formation were determined experimentally using this situ IR spectroscopic data. The catalysts showed excellent activity and good stability in these reactions.

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