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RESEARCH PRODUCT
Proximity Effect using a Nanocage Structure: Polyhedral Oligomeric Silsesquioxane-Imidazolium Tetrachloro- palladate Salt as a Precatalyst for the Suzuki-Miyaura Reaction in Water
Esther CarbonellMichelangelo GruttadauriaCarmela AprileFrancesco GiacaloneLucia Anna BivonaLucia Anna Bivonasubject
chemistry.chemical_elementSalt (chemistry)supported catalyst010402 general chemistry01 natural sciencesCatalysisCatalysisInorganic Chemistrychemistry.chemical_compoundNanocagesX-ray photoelectron spectroscopyPolymer chemistryOrganic chemistrysupported catalystsPhysical and Theoretical Chemistrychemistry.chemical_classification010405 organic chemistryChemistryOrganic Chemistrypalladiumcage compoundSilsesquioxane0104 chemical sciencesBiphenyl compoundphase-transfer catalysiphase-transfer catalysisC-C couplingcage compoundsProximity effect (atomic physics)Palladiumdescription
A polyhedral oligomeric silsesquioxane-imidazolium tetrachloropalladate salt (POSS-Imi-PdCl4) was prepared by the reaction of a polyhedral oligomeric silsesquioxane-imidazolium chloride salt (POSS-Imi-Cl) with PdCl2 and used as a pre-catalyst for the Suzuki-Miyaura reaction in water at 100 °C at a low loading (0.08-0.16 mol %). Biphenyl compounds were isolated in high to excellent yields. A comparison of the POSS-based catalyst with the corresponding catalyst without the nanocage structure (i.e., 1-butyl-3-methylimidazolium tetrachloropalladate) highlighted the role of the POSS structure to reach higher yields in the Suzuki-Miyaura reaction. This result is ascribed to a proximity effect of the imidazolium moieties linked to the nanocage structure. Fresh and used catalytic materials were characterised by using X-ray photoelectron spectroscopy and TEM.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2016-05-09 |