Silica aerogel-iron oxide nanocomposites:: recoverable catalysts in conjugate additions and in the Biginelli reaction

Ferrihydrite silica aerogels containing 11-13% iron and a surface area of 500-600 m(2)/g are catalysts for the title reactions. They are recovered and reused without loss of activity. (C) 2003 Elsevier Science Ltd. All rights reserved.