ABSTRACT
This review discusses the advances in the use of silica-supported polyphosphoric acid (PPA-SiO2) as a green and reusable heterogeneous catalyst in the preparation of various organic compounds and pharmaceutical intermediates. PPA-SiO2 could be recovered and reused several times without significant loss of their efficiency. In this review, we attempt to give an overview of the applications of PPA-SiO2 as a catalyst in condensation, cyclization, and addition reactions for the preparation of various organic compounds.
GRAPHICAL ABSTRACT
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Acknowledgments
The authors are thankful to the Department of Chemistry, Gujarat University, Ahmedabad, for providing the necessary facilities. UGC-Info net and INFLIBNET Gujarat University are acknowledged for providing the e-source facilities.