Catalytic conversions of isocyanate to urea and glucose to levulinate esters over mesoporous α-Ti(HPO4)2·H2O in green media

Article abstract of DOI:10.1039/d0nj03182h

We have described a facile solvothermal synthesis of a sheet-like α-Ti(HPO4)2·H2O nanomaterial. The material comprises 10.7 nm nanoparticles along with ordered mesopores throughout its hexagonal building blocks. The material possesses a bandgap of 3.86 eV and works as an efficient catalyst for the selective synthesis of ureas from a broad range of isocyanates in the presence of H2O at room temperature with a high product yield (up to 93%) and a TOF value up to 15.25 h-1. The α-Ti(HPO4)2·H2O nanomaterial also catalytically converts glucose to levulinic acid (LA) and subsequently LA to alkyl levulinates in the presence of different alcohols with a high product yield (up to 98%) and a TOF value up to 43.00 h-1. Furthermore, all the reactions are performed under green and facile catalytic conditions without using any hazardous solvent. The α-Ti(HPO4)2·H2O catalyst material was also found to be reusable for manifold cycles for all the reactions, keeping its catalytic efficiency along with its structural and morphological characteristics unaffected, supporting its industrial relevance.

Full text of DOI:10.1039/d0nj03182h

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I. Hazra chowdhury, S. Biswas, P. Chakrabortty and S. M. Islam, New J. Chem., 2020, DOI:
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0.1039/D0NJ03182H.
Volume 42
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March 2018
Pages 3963-4776
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ISSN 1144-2546
PAPER
Chechia Hu, Tzu-Jen Lin et al.
Yellowish and blue luminescent graphene oxide quantum dots
prepared via a microwave-assisted hydrothermal route using
H2O2 and KMnO4 as oxidizing agents
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Page 9 of 9
New Journal of Chemistry
View Article Online
DOI: 10.1039/D0NJ03182H
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Graphical Abstract
Catalytic Conversions of Isocyanate to Urea and Glucose to Levulinate Esters
over Mesoporous α-Ti(HPO ) . H O in Green Media
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Arpita Hazra Chowdhury, Ipsita Hazra Chowdhury, Surajit Biswas, Pekham Chakrabortty and
Sk. Manirul Islam*
Department of Chemistry, University of Kalyani, Kalyani, Nadia, 741235, W.B., India
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Facile synthesis
High Yield
High TON/TOF
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High Selectivity
Green Media
Reusability
Cost Effective