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Highly Electrophilic, Catalytically Active and Redox‐Responsive Cobaltoceniumyl and Ferrocenyl Triazolylidene Coinage Metal Complexes

A convenient access to a triad of triazoles with ferrocenyl and cobaltoceniumyl substituents is reported. N‐Alkylation, deprotonation and metalation with Cu(I)/Ag(I)/Au(I) synthons affords the heteroleptic triazolylidene complexes. Due to the combination of neutral, electron‐donating ferrocenyl subs...

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Autores principales: Vanicek, Stefan, Podewitz, Maren, Stubbe, Jessica, Schulze, Dennis, Kopacka, Holger, Wurst, Klaus, Müller, Thomas, Lippmann, Petra, Haslinger, Simone, Schottenberger, Herwig, Liedl, Klaus R., Ott, Ingo, Sarkar, Biprajit, Bildstein, Benno
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6100101/
https://www.ncbi.nlm.nih.gov/pubmed/29214677
http://dx.doi.org/10.1002/chem.201705051
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author Vanicek, Stefan
Podewitz, Maren
Stubbe, Jessica
Schulze, Dennis
Kopacka, Holger
Wurst, Klaus
Müller, Thomas
Lippmann, Petra
Haslinger, Simone
Schottenberger, Herwig
Liedl, Klaus R.
Ott, Ingo
Sarkar, Biprajit
Bildstein, Benno
author_facet Vanicek, Stefan
Podewitz, Maren
Stubbe, Jessica
Schulze, Dennis
Kopacka, Holger
Wurst, Klaus
Müller, Thomas
Lippmann, Petra
Haslinger, Simone
Schottenberger, Herwig
Liedl, Klaus R.
Ott, Ingo
Sarkar, Biprajit
Bildstein, Benno
author_sort Vanicek, Stefan
collection PubMed
description A convenient access to a triad of triazoles with ferrocenyl and cobaltoceniumyl substituents is reported. N‐Alkylation, deprotonation and metalation with Cu(I)/Ag(I)/Au(I) synthons affords the heteroleptic triazolylidene complexes. Due to the combination of neutral, electron‐donating ferrocenyl substituents and cationic, strongly electron‐withdrawing cobaltocenium substituents, the mesoionic carbene (MIC) ligands of these complexes are electronically interesting “push–pull”, “pull–push” and “pull–pull” metalloligands with further switchable redox states based on their fully reversible Fe(II)/Fe(III), (ferrocene/ferrocenium) and Co(III)/Co(II), (cobaltocenium/cobaltocene) redox couples. These are the first examples of metal complexes of (di)cationic NHC ligands based on cobaltoceniumyl substituents. DFT calculated Tolman electronic parameter (TEP) of the new MIC ligands, show these metalloligands to be extremely electron‐poor NHCs with properties unmatched in other carbene chemistry. Utilization of these multimetallic electronically tunable compounds in catalytic oxazoline synthesis and in antitumor studies are presented. Remarkably, 1 mol % of the Au(I) complex with the dicationic MIC ligand displays full catalytic conversion, without the need for any other additives, in less than 2 hours at ambient temperatures. These results thus firmly establish these new classes of cobaltoceniumyl based (di)cationic MIC ligands as prominent players in several branches of chemistry.
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spelling pubmed-61001012018-08-27 Highly Electrophilic, Catalytically Active and Redox‐Responsive Cobaltoceniumyl and Ferrocenyl Triazolylidene Coinage Metal Complexes Vanicek, Stefan Podewitz, Maren Stubbe, Jessica Schulze, Dennis Kopacka, Holger Wurst, Klaus Müller, Thomas Lippmann, Petra Haslinger, Simone Schottenberger, Herwig Liedl, Klaus R. Ott, Ingo Sarkar, Biprajit Bildstein, Benno Chemistry Full Papers A convenient access to a triad of triazoles with ferrocenyl and cobaltoceniumyl substituents is reported. N‐Alkylation, deprotonation and metalation with Cu(I)/Ag(I)/Au(I) synthons affords the heteroleptic triazolylidene complexes. Due to the combination of neutral, electron‐donating ferrocenyl substituents and cationic, strongly electron‐withdrawing cobaltocenium substituents, the mesoionic carbene (MIC) ligands of these complexes are electronically interesting “push–pull”, “pull–push” and “pull–pull” metalloligands with further switchable redox states based on their fully reversible Fe(II)/Fe(III), (ferrocene/ferrocenium) and Co(III)/Co(II), (cobaltocenium/cobaltocene) redox couples. These are the first examples of metal complexes of (di)cationic NHC ligands based on cobaltoceniumyl substituents. DFT calculated Tolman electronic parameter (TEP) of the new MIC ligands, show these metalloligands to be extremely electron‐poor NHCs with properties unmatched in other carbene chemistry. Utilization of these multimetallic electronically tunable compounds in catalytic oxazoline synthesis and in antitumor studies are presented. Remarkably, 1 mol % of the Au(I) complex with the dicationic MIC ligand displays full catalytic conversion, without the need for any other additives, in less than 2 hours at ambient temperatures. These results thus firmly establish these new classes of cobaltoceniumyl based (di)cationic MIC ligands as prominent players in several branches of chemistry. John Wiley and Sons Inc. 2018-01-17 2018-03-12 /pmc/articles/PMC6100101/ /pubmed/29214677 http://dx.doi.org/10.1002/chem.201705051 Text en © 2018 The Authors. Published by Wiley-VCH Verlag GmbH & Co. KGaA. This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
spellingShingle Full Papers
Vanicek, Stefan
Podewitz, Maren
Stubbe, Jessica
Schulze, Dennis
Kopacka, Holger
Wurst, Klaus
Müller, Thomas
Lippmann, Petra
Haslinger, Simone
Schottenberger, Herwig
Liedl, Klaus R.
Ott, Ingo
Sarkar, Biprajit
Bildstein, Benno
Highly Electrophilic, Catalytically Active and Redox‐Responsive Cobaltoceniumyl and Ferrocenyl Triazolylidene Coinage Metal Complexes
title Highly Electrophilic, Catalytically Active and Redox‐Responsive Cobaltoceniumyl and Ferrocenyl Triazolylidene Coinage Metal Complexes
title_full Highly Electrophilic, Catalytically Active and Redox‐Responsive Cobaltoceniumyl and Ferrocenyl Triazolylidene Coinage Metal Complexes
title_fullStr Highly Electrophilic, Catalytically Active and Redox‐Responsive Cobaltoceniumyl and Ferrocenyl Triazolylidene Coinage Metal Complexes
title_full_unstemmed Highly Electrophilic, Catalytically Active and Redox‐Responsive Cobaltoceniumyl and Ferrocenyl Triazolylidene Coinage Metal Complexes
title_short Highly Electrophilic, Catalytically Active and Redox‐Responsive Cobaltoceniumyl and Ferrocenyl Triazolylidene Coinage Metal Complexes
title_sort highly electrophilic, catalytically active and redox‐responsive cobaltoceniumyl and ferrocenyl triazolylidene coinage metal complexes
topic Full Papers
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6100101/
https://www.ncbi.nlm.nih.gov/pubmed/29214677
http://dx.doi.org/10.1002/chem.201705051
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