Silicon polypodands 1-7 were found to be powerful complexing agents of alkali metal salts, even in low polarity media (chlorobenzene) and hence very efficient phase-transfer catalysts. Their catalytic activity was measured in typical anion-promoted reactions under solid-liquid phase-transfer catalysis (SL-PTC) conditions. It is mainly determined by the complexing ability of the ligand, increasing with the number of silicon atoms and binding sites. Comparison with traditional phase-transfer catalysts showed that these polypodands are better catalysts not only than open-chain PEG400Me2 and TRIDENT, but even than more sophisticated macrocyclic polyethers such as DCH18C6.
|Titolo:||Silicon polypodands : a new class of efficient solid-liquid phase-transfer catalysts|
LANDINI, DARIO (Secondo)
|Parole Chiave:||Silicon polypodands; metal complexing agents; phase transfer catalisys; solid-liquid phase transfer catalyzed reactions|
|Settore Scientifico Disciplinare:||Settore CHIM/04 - Chimica Industriale|
|Data di pubblicazione:||2004|
|Digital Object Identifier (DOI):||10.1016/j.tet.2004.06.049|
|Appare nelle tipologie:||01 - Articolo su periodico|