Noncovalent Immobilization of Cationic Ruthenium Complex in a Metal–Organic Framework by Ion Exchange Leading to a Heterogeneous Olefin Metathesis Catalyst for Use in Green Solvents
A simple strategy for noncovalentimmobilization of an olefin metathesiscatalyst inside a (Cr)MIL-101-SO3Na metal–organic framework (MOF) was presented. The olefin metathesis active core—an alkylidene complex bearing an ammonium-tagged NHC ligand (Apeiron’s FixCat)—was immobilized by ion exchange facilitated by the use of crown ether. The hybrid material thus obtained was shown with a number of model
Large‐Scale Synthesis of a Niche Olefin Metathesis Catalyst Bearing an Unsymmetrical N‐Heterocyclic Carbene (NHC) Ligand and its Application in a Green Pharmaceutical Context
large‐scale synthesis of known Ru olefinmetathesis catalyst VII featuring an unsymmetrical N‐heterocyclic carbene (NHC) ligand with one 2,5‐diisopropylphenyl (DIPP) and one thiophenylmethylene N‐substituent is reported. The optimised procedure does not require column chromatography in any step and allows for preparation of up to 0.5 kg batches of the catalyst from simple precursors. The application profile
Assisted tandem catalytic RCM-aromatization in the synthesis of pyrroles and furans
作者:Bernd Schmidt、Stefan Krehl、Eric Jablowski
DOI:10.1039/c2ob25543j
日期:——
An assisted tandem catalytic transformation of diallyl amines and diallyl ethers into N-aryl pyrroles and furans, respectively, is described. The sequence relies on ring closing metathesis followed by dehydrogenation of the initially formed dihydropyrroles and dihydrofurans. Both steps are Ru-catalyzed, but the sequence requires only one precatalyst, because conversion of the metathesis catalyst into
Regioselectivity in the Formation of Small- and Medium-Sized Cyclic Ethers by Diene-Ene Ring-Closing Metathesis
作者:Sudipta Basu、Herbert Waldmann
DOI:10.1021/jo052367y
日期:2006.5.1
In the formation of medium-sized ethers by diene-ene ring-closing metathesis, the formation of cyclic allyl ethers with a smaller ring size and of pentadienyl ethers with a larger ring size compete with each other. In the competition between six- and eight-membered and seven- and nine-membered ring formation, the smaller rings are formed exclusively, whereas in the competition between the five- and
Oral care compositions with an effective flavor display
申请人:The Procter & Gamble Company
公开号:US10925820B2
公开(公告)日:2021-02-23
An oral care composition containing at least 4% fatty amphiphile and from about 0.4% to about 5%, by weight of the composition, total flavor components. The flavor components contain at least 14%, by weight of the flavor components, of one or more high displaying flavor components.