31410-11-4Relevant academic research and scientific papers
Ring-Closing Olefin Metathesis Catalyzed by Well-Defined Vanadium Alkylidene Complexes
Belov, Dmitry S.,Tejeda, Gabriela,Tsay, Charlene,Bukhryakov, Konstantin V.
supporting information, p. 4578 - 4582 (2021/02/11)
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.
Reaction of N-Benzyl-1,1'-iminobis-2-butanols with 70percent w/w Sulfuric Acid
Hernestam, Sven,Stenvall, Gillis,Olsson, Thomas
, p. 647 - 651 (2007/10/02)
Treatment of (S:R)-N-benzyl-1,1'-iminobis-2-butanol with 70percent w/w sulfuric acid gives cis- and trans-N-benzyl-2,6-diethylmorpholines (15 and 74percent, respectively) and N-alkenyl-4-ethyl-1,2,3,4-tetrahydroisoquinolines (5percent).Hydrogenation of th
