Abstract
Mannich-type reactions in water can be carried out without the need for any added surfactants and organic solvents. The water-soluble calix[4]resorcinarene sulfonic acid, 2,8,14,20-tetramethyl-5,11,17,23-tetrakis(sulfomethyl)calix[4]resorcinarene, which functions as an efficient inverse phase-transfer catalyst, can be recovered as an aqueous solution and recycled after the simple extraction of the water-insoluble products.
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