Proximity Effect using a Nanocage Structure: Polyhedral Oligomeric Silsesquioxane-Imidazolium Tetrachloro- palladate Salt as a Precatalyst for the Suzuki-Miyaura Reaction in Water
作者： Lucia Anna Bivona , Francesco Giacalone , Esther Carbonell , Michelangelo Gruttadauria , Carmela Aprile
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摘要: A polyhedral oligomeric silsesquioxane-imidazolium tetrachloropalladate salt (POSS-Imi-PdCl4) was prepared by the reaction of a chloride (POSS-Imi-Cl) with PdCl2 and used as pre-catalyst for Suzuki–Miyaura in water at 100 °C low loading (0.08–0.16 mol %). Biphenyl compounds were isolated high to excellent yields. comparison POSS-based catalyst corresponding without nanocage structure (i.e., 1-butyl-3-methylimidazolium tetrachloropalladate) highlighted role POSS reach higher yields reaction. This result is ascribed proximity effect imidazolium moieties linked structure. Fresh catalytic materials characterised using X-ray photoelectron spectroscopy TEM.
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