Synthesis and characterization of a porous acidic polymer containing pendant pyrazine moieties based on calix[4]resorcinarene: A green and retrievable solid acid catalyst for preparation of benzimidazole heterosystems
محورهای موضوعی : Organic and Inorganic synthesis
Somayeh elahi
1
,
Hamid Derispour
2
1 - گروه مهندسی شیمی، واحد بین المللی اروند، دانشگاه آزاد اسلامی ، آبادان، ایران
2 - Department of Chemical Engineering, Arvand international Branch, Islamic Azad University, Abadan, Iran
کلید واژه: Acidic organocatalyst, polymer supported ionic liquid, heterogeneous solid acid catalyst, pendant pyrazine groups, porous polymer, heterocyclic compounds, benzimidazole,
چکیده مقاله :
In this work, for the first time, a cationic polymer containing pendant pyrazine groups was synthesized via post-functionalization of the porous polymeric backbone based on a calix[4]resorcinarene. The formation of this cationic polymer was confirmed by elemental analysis, scanning electron microscopy (SEM), thermal gravimetric analysis (TGA) and derivative thermogravimetric (DTG) analysis. Subsequently, HSO4 anion was incorporated into the polymer along the pyrazine pendant groups via a well-known ion exchange reaction. Elemental analysis data revealed that the cationic polymer was conveniently loaded with the desired Bronsted acid anion; therefore, it provides a novel heterogeneous acid catalyst for achieving synthetic goals.
The acidic organocatalyst enables environmentally benign synthesis of benzimidazole heterocyclic compounds in ethanol. The unique features of this catalyst, such as superior thermal stability, recyclability, excellent catalytic activity in terms of yield and reaction time are potentially important for the applications of this catalyst in the industry.
In this work, for the first time, a cationic polymer containing pendant pyrazine groups was synthesized via post-functionalization of the porous polymeric backbone based on a calix[4]resorcinarene. The formation of this cationic polymer was confirmed by elemental analysis, scanning electron microscopy (SEM), thermal gravimetric analysis (TGA) and derivative thermogravimetric (DTG) analysis. Subsequently, HSO4 anion was incorporated into the polymer along the pyrazine pendant groups via a well-known ion exchange reaction. Elemental analysis data revealed that the cationic polymer was conveniently loaded with the desired Bronsted acid anion; therefore, it provides a novel heterogeneous acid catalyst for achieving synthetic goals.
The acidic organocatalyst enables environmentally benign synthesis of benzimidazole heterocyclic compounds in ethanol. The unique features of this catalyst, such as superior thermal stability, recyclability, excellent catalytic activity in terms of yield and reaction time are potentially important for the applications of this catalyst in the industry.
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