Ligands designed to provide highly active catalyst complexes
US9533297B2 · kind B2 · utility
6Cited by
170References
20Claims
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Key dates
| Filing date | Feb 22, 2013 |
| Grant date | Jan 3, 2017 |
| Priority date | — |
| Expiry date | Feb 22, 2033 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/52
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A series of ligands with site specific electron donating substituents that form a catalyst complex with a transition metal and are suitable for catalysis of atom transfer radical reactions, including ATRP are described. Faster catalysis rates were observed allowing for low catalyst concentrations and linear increases in molecular weight with monomer conversion, and narrow molecular weight distributions. Cyclic voltammetry revealed that increasing the strength and number of conjugated electron donating groups resulted in more stable complexes and larger ATRP equilibrium constants.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.