- Ring-Closing Olefin Metathesis Catalyzed by Well-Defined Vanadium Alkylidene Complexes
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Vanadium-based catalysts have shown activity and selectivity in ring-opening metathesis polymerization of strained cyclic olefins comparable to those of Ru, Mo, and W catalysts. However, the application of V alkylidenes in routine organic synthesis is limited. Here, we present the first example of ring-closing olefin metathesis catalyzed by well-defined V chloride alkylidene phosphine complexes. The developed catalysts exhibit tolerance to various functional groups, such as an ether, an ester, a tertiary amide, a tertiary amine, and a sulfonamide. The size and electron-donating properties of the imido group and the phosphine play a crucial role in the stability of active intermediates. Reactions with ethylene and olefins suggest that both β-hydride elimination of the metallacyclobutene and bimolecular decomposition are responsible for catalyst degradation.
- Belov, Dmitry S.,Tejeda, Gabriela,Tsay, Charlene,Bukhryakov, Konstantin V.
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supporting information
p. 4578 - 4582
(2021/02/11)
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- Synthesis of six-membered cyclic sulfonimidamides
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A general synthetic route to six-membered cyclic N-aryl- and N-alkyl-substituted sulfonimidamides via an intramolecular ring closure of suitably functionalised acyclic sulfonimidamides is described. The structure of this new ring system was confirmed by v
- Sen, Indira,Kloer, Daniel,Hall, Roger,Pal, Sitaram
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p. 3018 - 3028
(2013/11/06)
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