Abstract
A novel covalently attached silica-immobilized oxo-rhenium catalyst was prepared by the reaction of perrhenic acid and 3-chloropropyl functionalized mesoporous SBA-15, in which the oxo-rhenium species is chemically bonded to the support, preventing leaching. The prepared silica-immobilized oxo-rhenium was found to be an efficient and recyclable catalyst for the one-pot' condensation/oxidation of aldehydes and primary amines to nitrones in high yields using urea-hydrogen peroxide as a terminal oxidant under mild reaction conditions.
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