Identifying the missing link in catalyst transfer polymerization.

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 η²-Ni(0)-thiophene species and their relevance to the mechanism of CTP. These results confirm the viability of C,C-η² 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-κ² species may also b

SUBMITTER: He W 

PROVIDER: S-EPMC6155128 | biostudies-literature | 2018 Sep

REPOSITORIES: biostudies-literature