Onium salts immobilized on alumina have been shown to be effective phase-transfer catalysts in comparison to analogous soluble catalysts adsorbed on silica or alumina. Appreciable selectivity has been observed in the nucleophilic substitution reaction with aqueous potassium iodide toward halide of different sizes (1-bromobutane, 1-bromooctane, and 1-bromohexadecane). Alumina and silica gel immobilized onium salts can also act very effectively as reagents when used in stoichiometric quantities. © 1982, American Chemical Society. All rights reserved.
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