title: New metathesis catalyst bearing chromanyl moieties at the N-heterocyclic carbene ligand.
abstract: The synthesis of a new type of Hoveyda-Grubbs 2(nd) generation catalyst bearing a modified N-heterocyclic carbene ligands is reported. The new catalyst contains an NHC ligand symmetrically substituted with chromanyl moieties. The complex was tested in model CM and RCM reactions. It showed very high activity in CM reactions with electron-deficient α,β-unsaturated compounds even at 0 °C. It was also examined in more demanding systems such as conjugated dienes and polyenes. The catalyst is stable, storable and easy to purify.
authors.affiliation: University of Białystok, Institute of Chemistry, Ciołkowskiego Street 1K, 15-245 Białystok; Poland.
authors.forename: Agnieszka
authors.initials: A
authors.lastname: Hryniewicka
authors.affiliation: University of Białystok, Institute of Chemistry, Ciołkowskiego Street 1K, 15-245 Białystok; Poland.
authors.forename: Szymon
authors.initials: S
authors.lastname: Suchodolski
authors.affiliation: University of Białystok, Institute of Chemistry, Ciołkowskiego Street 1K, 15-245 Białystok; Poland.
authors.forename: Agnieszka
authors.initials: A
authors.lastname: Wojtkielewicz
authors.affiliation: University of Białystok, Institute of Chemistry, Ciołkowskiego Street 1K, 15-245 Białystok; Poland.
authors.forename: Jacek W
authors.initials: JW
authors.lastname: Morzycki
authors.affiliation: University of Białystok, Institute of Chemistry, Ciołkowskiego Street 1K, 15-245 Białystok; Poland.
authors.forename: Stanisław
authors.initials: S
authors.lastname: Witkowski
keywords: Ru-carbene; chromane derivatives; metathesis catalyst; nitrogen heterocycles; olefin metathesis