The mechanistic duality of (thio)urea organocatalysts for ring-opening polymerization
Autor: | Matthew K. Kiesewetter, Jinal U. Pothupitiya, Nayanthara U. Dharmaratne |
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Rok vydání: | 2019 |
Předmět: |
Reaction mechanism
Organic Chemistry Thio 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Biochemistry Ring-opening polymerization Combinatorial chemistry 0104 chemical sciences Catalysis chemistry.chemical_compound Monomer chemistry Polymerization Urea Reactivity (chemistry) Physical and Theoretical Chemistry 0210 nano-technology |
Zdroj: | Organicbiomolecular chemistry. 17(13) |
ISSN: | 1477-0539 |
Popis: | Among the various catalysts for ROP, H-bonding organocatalysts stand out in the precise level of reaction control they are able to render during ROP. The H-bonding class of organocatalysts are thought to effect ROP via dual activation of both monomer and chain end. (Thio)urea mediated ROP has experienced a renaissance as a new polymerization mechanism - mediated by imidate or thioimidate species - facilitates new modes of reactivity and new synthetic abilities. Indeed, the urea class of H-bond donors has been shown to be more active than their corresponding thioureas. The imidate mechanism remains highly active in polar solvents and exhibits remarkable control - and 'living' behavior - under solvent-free conditions, and a broad range of temperatures is accessible. The advancements in synthetic abilities have all evolved through a greater understanding of reaction mechanism. Through the continued synergistic advances of catalysis and material, the (thio)urea class of catalyst can find use in a host of potential applications, research and industrial environments. |
Databáze: | OpenAIRE |
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