Cyclic (Alkyl)(amino)carbenes (CAACs) in Ruthenium Olefin Metathesis
نویسندگان
چکیده
Discovered in 2005, cyclic (alkyl)(amino)carbenes (CAACs) have led to numerous discoveries the field of ruthenium olefin metathesis, until then largely dominated by well-known N-heterocyclic...
منابع مشابه
Key processes in ruthenium-catalysed olefin metathesis.
While the fundamental series of [2+2]cycloadditions and retro[2+2]cycloadditions that make up the pathways of ruthenium-catalysed metathesis reactions is well-established, the exploration of mechanistic aspects of alkene metathesis continues. In this Feature Article, modern mechanistic studies of the alkene metathesis reaction, catalysed by well-defined ruthenium complexes, are discussed. Broad...
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The success of enantioselective olefin metathesis relies on the design of enantioenriched alkylidene complexes capable of transferring stereochemical information from the catalyst structure to the reactants. Cyclometalation of the NHC ligand has proven to be a successful strategy to incorporate stereogenic atoms into the catalyst structure. Enantioenriched complexes incorporating this design el...
متن کاملModel compounds of ruthenium-alkene intermediates in olefin metathesis reactions.
The development of a model system to study ruthenium-olefin complexes relevant to the mechanism of olefin metathesis is reported. Upon addition of 1,2-divinylbenzene to (H2IMes)(py2)(Cl)2Ru=CHPh (H2IMes = 1,3-dimesityl-4,5-dihydroimidazol-2-ylidene), two ruthenium-olefin adducts are formed. On the basis of 1H NMR spectroscopy experiments and X-ray crystallographic analysis, these complexes are ...
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The state-of-the-art in olefin metathesis is application of N-heterocyclic carbene (NHC)-containing ruthenium alkylidenes for the formation of internal C=C bonds and of cyclic alkyl amino carbene (CAAC)-containing ruthenium benzylidenes in the production of terminal olefins. A straightforward synthesis of bis(CAAC)Ru indenylidene complexes, which are highly effective in the formation of both te...
متن کاملPhosphites as ligands in ruthenium-benzylidene catalysts for olefin metathesis.
The use of phosphites in second generation, ruthenium-based olefin metathesis pre-catalysts leads to an improvement in catalyst stability and activity at low catalyst loadings.
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ژورنال
عنوان ژورنال: ACS Catalysis
سال: 2021
ISSN: ['2155-5435']
DOI: https://doi.org/10.1021/acscatal.0c05508