A copper-incorporated mesoporous silica catalyst was synthesized and characterized by N2 adsorption analysis, HRTEM, EDX-elemental analysis, and XRD studies. The silica material possesses mesopores of dimension 3-5 nm. Incorporation of copper within the silica network produces enhanced surface acidity in comparison to pure silica, which is reflected in the sonication-assisted rapid reaction between dimedone, formaldehyde, and amines. Sonication-mediated room temperature synthesis was proved to be more convenient and rapid than ordinary stirring. A standard leaching experiment proved that the reaction was heterogeneous with this recyclable catalyst. Graphical abstract: [Figure not available: see fulltext.] © 2015 Springer-Verlag Wien.

CHHANDA MUKHOPADHYAY

Chemistry

S RAY

A BHAUMIK

B BANERJEE

P MANNA

University of Calcutta (informally known as Calcutta University or CU) is a collegiate public state university located in Kolkata, West Bengal, India.&nbsp;Within India it is recognized as a &quot;Five-Star University&quot; and accredited &quot;A&quot; Grade by National Assessment and Accreditation Council.

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The University of Calcutta has secured the Fifth position among the Universities of India in the prestigious &quot;Indian University Ranking 2019&quot; list, released by the NIRF of the Ministry of Human Resource Development, Government of India.

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It was established on 24 January 1857, and was one of the first institutions in Asia to be established as a multidisciplinary and Western-style university. Its alumni and faculty include several heads of state, heads of government, social reformers, prominent artists, only academy award winner and Dirac medal winner in India, many Fellows of the Royal Society and five Nobel laureates as of 2019 which is highest in South Asia.

University Of Calcutta

Monatshefte für Chemie - Chemical Monthly

Fluoroboric acid (HBF4) adsorbed on mesoporous silica nanoparticles of 600 nm dimension was synthesized and characterized by N 2 adsorption, HRTEM, EDX, XPS. The applicability of silica-HBF 4 was probed through the sonication assisted synthesis of pyrroloacridinones in ecofriendly solvent ethanol. Standard leaching experiment was performed to show that the reaction was heterogeneous with this recyclable catalyst. © 2014 Elsevier B.V. All rights reserved.

Fulltext

Ultrasonics Sonochemistry

Simultaneous sonication assistance for the synthesis of pyrroloacridinones and its efficient catalyst HBF4 supported on uniform spherical silica nanoparticles

Highly stable, environmentally benign ZnFe2O4 nanopowder was prepared, characterized and applied in the one-pot, three-component synthesis of 4H-pyrans in water. The ZnFe2O 4 catalyst provides both acidic (Fe3+) and basic functionalities (O2-) as the reaction requires. The advantages of this method lie in its simplicity, cost effectiveness, environmental friendliness and easier scaling up for large scale synthesis. Water was exploited both as a reaction medium as well as a medium for synthesis of the catalyst. Moreover, water was the only byproduct. The present report puts forward an application of 4H-pyrans for the synthesis of 1,4-DHPs. This is the first attempt towards the synthesis of 4H-pyran-3-carboxylate from 4H-pyran-3-carboxamide. The corresponding functional group interconversion from amide to ester is rare in organic synthesis. © 2014 The Royal Society of Chemistry.

Green Chemistry

Heterogeneous ditopic ZnFe2O4 catalyzed synthesis of 4H-pyrans: Further conversion to 1,4-DHPs and report of functional group interconversion from amide to ester

A new heterogeneous MCM-41 silica supported HPF6 catalyst has been synthesized and characterized using an array of sophisticated analytical techniques like BET, XRD, HRTEM, EDX, 29Si MAS NMR, TGA, FTIR, and pH measurement. The broad applicability of silica-HPF6 was probed through a library synthesis of highly substituted 1,4-dihydropyridines (1,4-DHPs). The 1,4-DHPs are further oxidized to pyridines with aqueous H 2O2 as stoichiometric oxidant which is considered as an abundant and green oxidant. The pyridines spontaneously generate low molecular mass self-aggregated organic materials (LMSOMs). Their one-dimensional packing and interesting photophysical properties are reported. Synthesis using water as a solvent is of paramount importance for its sustainable green impact. Further, carbon dioxide and water were the only by-products, which added to its attractiveness. This silica-HPF6 catalyst retained its activity even after being exposed to ambient atmosphere for 10 days. © 2013 The Royal Society of Chemistry.

A new MCM-41 supported HPF6 catalyst for the library synthesis of highly substituted 1,4-dihydropyridines and oxidation to pyridines: Report of one-dimensional packing towards LMSOMs and studies on their photophysical properties

Multicomponent synthesis of 1,3-diaryl-hexahydropyrimidines by a one-pot reaction of 1,3-dicarbonyl compounds, amines and formaldehyde catalysed by FeCl3 in dichloromethane at room temperature (25-30 °C) has been reported. Double amino methylation occurs at the α-position of the 1,3-dicabonyl compounds/β-keto esters. The same methodology leads to spiro compounds with indane-1,3-dione. In this reaction, six molecules condense in one pot to form six new covalent bonds, thus, creating high atom economy. This is the first report of the synthesis of the substituted hexahydropyrimidines involving β-keto esters and its spiro analogues with indane-1,3-dione. © 2011 Elsevier Ltd. All rights reserved.

Tetrahedron Letters

FeCl3 catalysed two consecutive aminomethylation at the Î±-position of the Î²-dicarbonyl compounds: An easy access to hexahydropyrimidines and its spiro analogues

Journal of Molecular Catalysis A: Chemical

SiO2–CuCl2: An efficient and recyclable heterogeneous catalyst for one-pot synthesis of 3,4-dihydropyrimidin-2(1H)-ones

Heterogeneous silica-supported copper catalyst for the ultrasound-mediated rapid reaction between dimedone, formaldehyde, and amines at room temperature

Journal	Data powered by TypesetMonatshefte für Chemie - Chemical Monthly
Publisher	Data powered by TypesetSpringer-Verlag Wien
ISSN	0026-9247
Open Access	No