Applied Catalysis A: General, Vol.377, No.1-2, 64-69, 2010
Sulfonic acid supported on hydroxyapatite-encapsulated-gamma-Fe2O3 nanocrystallites as a magnetically Bronsted acid for N-formylation of amines
Treatment of aqueous formic acid (85%) with structurally diverse amines in the presence of a catalytic amount of sulfonic acid supported on hydroxyapatite-encapsulated-gamma-Fe2O3 [HAp@-gamma-Fe2O3] (0.9 mol.%) as a heterogeneous, reusable and highly efficient catalyst gave the corresponding formamides in good to excellent yields at room temperature. The magnetically catalytic system was recovered by-passing time consuming filtration operation by using an external magnet device. In addition to facility, this methodology, it also enhances product purity and promises economic as well as environmental benefits. (C) 2010 Elsevier B.V. All rights reserved.
Keywords:Magnetically catalytic system;Sulfonic acid;Hydroxyapatite-encapsulated-gamma-Fe2O3;Formylation