Identifying the missing link in catalyst transfer polymerization.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 30250037.
- Also identified by DOI 10.1038/s41467-018-06324-9 and PMC identifier 6155128.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
Nickel-catalyzed catalyst transfer polycondensation (CTP) of thiophenes is an efficient strategy for the controlled synthesis of polythiophenes. However, a detailed view of its reaction mechanism has remained elusive with unresolved questions regarding the geometry and bonding of critical Ni(0) thiophene intermediates. Herein, we provide experimental and computational evidence of structurally characterized square planar η<sup>2</sup>-Ni(0)-thiophene species and their relevance to the mechanism of CTP. These results confirm the viability of C,C-η<sup>2</sup> bound intermediates in CTP of thiophenes, providing an electronic rationale for the stability of such species, and thus that such processes can proceed as living polymerizations. We further show that C,S-κ<sup>2</sup> species may also be relevant in nickel-catalyzed CTP of thiophenes, providing new avenues for exploitation and optimization.
Medical subject headings
- Nickel
- Polymerization
- Polymers
- Thiophenes