چكيده فارسي :
Recently, the carbon based solid acid catalysts with high acidity and thermal stability have
received wide attention [1]. Although the sulfonated carbon catalyst is active its speration
from the reaction mixture is still achallenge during the practical application. The catalyst is
generally recovered by the filtration or centrifugation methods which are dependent on special
apparatus and time consuming. More recently, a magnetic sulfonatedmesoporous silica
catalyst was reported for thehydrolysis of biomass, indicating that the magnetismseparation
could be a feasible way to separate thecatalytic material from the reaction residues [2, 3].
Herein we report a method for the synthsis ofnew Magnetic Nano-catalyst with core-shell
structure (Fe3O4@C-SO3H).Fe3O4@C-SO3H has been synthesized through the hydrothermal
carbonization of glucose with magnetic cores and sulfonation of carbonaceous intermediate
with PTSA (Scheme). Subsequently, the structure and morphologyof the
preparednanocatalyst were studied with some differentspectroscopic, microscopic
andthermogravimetric techniques such as FT-IR, XRD, FESEM and CHNS-Analysis.The
magnetic Fe3O4 core makes the catalysts easily separated from reaction mixtures by using the
externally applied magnetic field
The application of this new nanocatalyst allows the synthesis of a Dihydopirimidinone
through the reaction of aldehydes with urea and β-ketoesters undersolvent-free conditions.
This synthetic pathway is a green protocol offering significant advantages, suchas easy
preparation of the catalyst, mild reaction conditions and minimization of chemicalwaste..
