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Ruthenium Olefin Metathesis Catalysts with N-Heterocyclic Carbene Ligands BearingN-Naphthyl Side Chains


Vieille-Petit, L; Clavier, H; Linden, A; Blumentritt, S; Nolan, S P; Dorta, R (2010). Ruthenium Olefin Metathesis Catalysts with N-Heterocyclic Carbene Ligands BearingN-Naphthyl Side Chains. Organometallics, 29(4):775-788.

Abstract

A series of second-generation ruthenium-based olefin metathesis catalysts bearing N-naphthylsubstituted N-heterocyclic carbene (NHC) ligands have been prepared and fully characterized. By reaction with the appropriate NHC, these complexes are readily accessible in one synthesis step from commercially available first generation precursors [RuCl2(=CHPh)(PCy3)2] (Grubbs’ I, GI) or [RuCl2(=CH-o-iPrO-Ph)(PCy3)] (Hoveyda-Grubbs’ I, HGI) by simple exchange of one phosphine ligand with the free NHCs. Time-dependent conversions in the ring-closing metathesis (RCM) of standard substrates leading to di- as well as trisubstituted olefins have been measured for these catalysts. When benchmarked against the parent SIMes-containing Grubbs’ II precatalyst (GII), most of these new NHC structures show enhanced reactivity in RCM. From these comparative studies, valuable information was gathered that shows that the alkyl substitution on the naphthyl side chains can enhance or lower the catalytic performance depending on the bulk and the position of these alkyl groups. The behavior of the best performing precatalysts has been investigated in the RCM of a series of representative substrates, in enyne metathesis reactions as well as in cross-metathesis (CM).

Abstract

A series of second-generation ruthenium-based olefin metathesis catalysts bearing N-naphthylsubstituted N-heterocyclic carbene (NHC) ligands have been prepared and fully characterized. By reaction with the appropriate NHC, these complexes are readily accessible in one synthesis step from commercially available first generation precursors [RuCl2(=CHPh)(PCy3)2] (Grubbs’ I, GI) or [RuCl2(=CH-o-iPrO-Ph)(PCy3)] (Hoveyda-Grubbs’ I, HGI) by simple exchange of one phosphine ligand with the free NHCs. Time-dependent conversions in the ring-closing metathesis (RCM) of standard substrates leading to di- as well as trisubstituted olefins have been measured for these catalysts. When benchmarked against the parent SIMes-containing Grubbs’ II precatalyst (GII), most of these new NHC structures show enhanced reactivity in RCM. From these comparative studies, valuable information was gathered that shows that the alkyl substitution on the naphthyl side chains can enhance or lower the catalytic performance depending on the bulk and the position of these alkyl groups. The behavior of the best performing precatalysts has been investigated in the RCM of a series of representative substrates, in enyne metathesis reactions as well as in cross-metathesis (CM).

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Department of Chemistry
Dewey Decimal Classification:540 Chemistry
Language:English
Date:2010
Deposited On:26 Mar 2010 13:16
Last Modified:07 Dec 2017 01:01
Publisher:American Chemical Society
ISSN:0276-7333
Funders:Alfred Werner Foundation, Legolotz Foundation, EC through the 7th framework program (CP-FP 211468-2–EUMET)
Publisher DOI:https://doi.org/10.1021/om9009697

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