Fe₃O4@MCM@ZrCI₂: A Practical Magnetic Mesoporous Zirconium-Based Nanocomposite as a Reusable Catalyst for the Synthesis of Spirooxindoles.

In the present study, we aimed to investigate the catalytic role of the newly reported MCM-41 -based nanocomposite in which the low acidity of this mesoporous moiety was favourably improved the stabilization of zirconium nanoparticles and was magnetized to make a facile work-up procedure as an applicable and efficient method. The prepared Fe₃O₄@MCM-41 @ZrCI₂ nanocomposite was successfully characterized using different analyses and then it was favourably exploited for the synthesis of spirooxindoles as the most prominent spiro compounds. As predicted, Fe₃O₄@MCM- 41 @ZrCI₂ showed considerable efficiency in the promotion of the studied reaction.

Organic/Inorganic Fe₃O₄@MCM-41@Zr-Piperazine: An Impressive Magnetite Nanocatalyst for -Butoxycarbonylation of Amines.

Fe₃O₄@MCM-41@Zirconium magnetic nanoparticles modified with piperazine (Fe₃O₄@MCM-41@Zr-piperazine), as a newly reported catalyst, shows excellent catalytic activity in -butoxycarbonylation of amines under the mild and solvent-free conditions. Accordingly, different derivatives of -butylcarbamates owning diverse aliphatic, aromatic and heteroaromatic amines were prepared efficiently. Good performance of this method for the majority of used complex or acid-sensitive substrates and facile separation of this nanocatalyst due to its superparamagnetic nature from the reaction mixture via an external magnetic field for several times are the most important striking features of this protocol.