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Identifying the missing link in catalyst transfer polymerization

Journal Article · · Nature Communications

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 be relevant in nickel-catalyzed CTP of thiophenes, providing new avenues for exploitation and optimization.

Research Organization:
SLAC National Accelerator Laboratory, Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Biological and Environmental Research (BER); Natural Sciences and Engineering Research Council (NSERC); National Institutes of Health (NIH), National Institute of General Medical Sciences (NIGMS)
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
1624115
Journal Information:
Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 9; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (5)

The Importance of Ligand‐Induced Backdonation in the Stabilization of Square Planar d 10 Nickel π‐Complexes journal March 2019
A robust nickel catalyst with an unsymmetrical propyl-bridged diphosphine ligand for catalyst-transfer polymerization journal September 2019
Catalyst-transfer polymerization of arylamines by the Buchwald–Hartwig cross-coupling journal January 2019
Direct experimental evaluation of ligand-induced backbonding in nickel metallacyclic complexes journal January 2019
Aldehydes and ketones influence reactivity and selectivity in nickel-catalysed Suzuki–Miyaura reactions journal January 2020


Figures / Tables (8)