Abstract
Nano-SiO2 catalyst was readily prepared from inexpensive starting materials in aqueous media which catalysed the synthesis a-aminophosphonates from aldehydes, amines and diethylphosphate under ultrasonication in water. High catalytic activity and ease of recovery from the reaction mixture using filtration, and reuse without significant losses in performance are additional eco-friendly attributes of this catalytic system. Unsupported ‘free’ nano-SiO2 has been shown to be a stable yet highly active catalyst for preparing a variety of a-aminophosphonates from one-pot three-component condensation reaction.
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