Stereospecific Diene Polymerization by Metal- π- Allyl Complexes and Mechanism of Stereoregulation
نویسندگان
چکیده
منابع مشابه
Stereospecific carbene polymerization with oxygenated Rh(diene) species.
Polymers bearing polar functionalities are important materials, since they exhibit beneficial properties with respect to adhesion, paint/printability and surface properties. Commercial synthesis of these materials is mainly based on radical processes, which (so far) only allow poor control over the stereochemistry of the resulting polymers. 2 ] Stereo-controlled polymerisation generally require...
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Addition of PMe3 to Mo2(allyl)4 afforded Mo2(allyl)4(PMe3)2, in which two of the allyl groups adopt an unprecedented micro2-eta1,eta3 bonding mode; theoretical studies elucidate the roles of the sigma- and pi-donor ligands in the interplay of metal-allyl and metal-metal bonding.
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We report on the synthesis, metal coordination, and catalytic impact of histidylidene, a histidine-derived N-heterocyclic carbene (NHC) ligand. The histidinium salt 3, comprising methyl substituents at both heterocyclic nitrogens and protected at the C- and N-terminus of the amino acid, was rhodated and iridated by a transmetallation protocol using Ag(2)O. Ambient temperature and short reaction...
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Theoretical calculations are performed to explore the origin of inherent tacticity in bulky methacrylates. Geometries and conformer distributions of monomers and oligomeric propagating radicals are calculated to study the impact of steric bulk and π-stacking interactions on the preferences for meso versus isotactic propagation. Consistent with the previous qualitative analyses by Satoh and Kami...
متن کاملCatalytic Stereospecific Allyl–Allyl Cross-Coupling of Internal Allyl Electrophiles with AllylB(pin)
Application of internal electrophiles in catalytic stereospecific allyl-allyl cross-coupling enable the rapid construction of multisubstituted 1,5-dienes, including those with all carbon quaternary centers. Compounds with minimal steric differentiation can be synthesized with high enantiomeric excess.
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ژورنال
عنوان ژورنال: Kobunshi
سال: 1971
ISSN: 0454-1138,2185-9825
DOI: 10.1295/kobunshi.20.835