A new silica based piperidine derivative has been designed, synthesized and characterized by solid state carbon 13 CP MAS NMR, BET surface area analysis, IR, TGA studies, elemental analysis and pH experiment. This has been efficiently utilized as a recyclable catalyst for both homo and hetero bis-Knoevenagel condensation products in aqueous-ethanol. This is the first report of the synthesis of hetero bis-Knoevenagel condensation products by our designed catalyst. © 2011 Elsevier B.V. All rights reserved.

CHHANDA MUKHOPADHYAY

Chemistry

S RAY

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

Catalysis Communications

A chromatography free synthesis of 2-amino-5-isatinylidenethiazol-4-ones from rhodanine, isatin, and amine under environmentally benevolent conditions is reported for the first time. The molecular scaffolds assimilating both indolinone and thiazolidinone moieties are reported to have great biological significance. © 2013 Elsevier Ltd. All rights reserved.

Tetrahedron Letters

Synthesis of molecular scaffolds assimilating both indolinone and thiazolidinone moieties under environmentally benevolent conditions

Highly stable, environmentally benign ZnTiO 3 nanopowder has been prepared via a sustainable sol-gel method. The nanopowder (90 nm) has been thoroughly characterized by SEM, XRD, EDS, Laser Raman, photoluminescence, UV and IR. The activity of the catalyst was probed through one-pot four-component reaction of aldehydes, ketones and two equivalent propanedinitriles in water without requiring any additives or anhydrous conditions. The reaction requires two different catalytic functions, i.e., an acidic one which is given by Ti(iv) ions and a basic one, given by the oxide ion incorporated within the ZnTiO 3 metal oxide framework. The advantages of this method lie in its simplicity, cost effectiveness, environmental friendliness, and easier scaling up for large scale synthesis without using high pressure, temperature and toxic chemicals. As water was used as a reaction medium and since we are particularly interested in the isolation of a non-aromatic intermediate, the elimination of poisonous HCN was prevented by the Lewis acid character of Ti 4+ up to a sufficiently high temperature. Thus, this process can be considered as a "green" process. Elimination of HCN at higher temperatures still maintains "green" attributes as HCN can be trapped by the basic catalyst under such conditions. Spontaneous generation of low molecular mass self-aggregated organic materials, their one-dimensional packing, and interesting photophysical properties are reported. © 2012 The Royal Society of Chemistry.

Green Chemistry

Zinc titanate nanopowder: An advanced nanotechnology based recyclable heterogeneous catalyst for the one-pot selective synthesis of self-aggregated low-molecular mass acceptor-donor-acceptor-acceptor systems and acceptor-donor-acceptor triads

A new methodology has been developed towards the synthesis of novel 2-amino-5-alkylidenethiazol-4-ones from ketones, amines, and rhodanine. This is the first report of the use of ketones in contrast to aldehydes in all the earlier reported procedures. A new heterogeneous dipolar catalyst is designed and synthesized for this reaction. The unique properties of this catalyst facilitate the synthesis of such compounds. These 5-alkylidene rhodanine precursors display wide range of biological activities to possess antiviral, antimicrobial, cardiotonic and anti-inflammatory effects. © 2011 Elsevier Ltd. All rights reserved.

Tetrahedron

Synthesis of 2-amino-5-alkylidenethiazol-4-ones from ketones, rhodanine, and amines with the aid of re-usable heterogeneous silica-pyridine based catalyst

A new methodology has been developed towards the room temperature synthesis of novel 2-amino-5-alkylidenethiazol-4-ones from aldehydes, amines and rhodanine in one-pot. A heterogeneous dipolar catalyst has been utilized for this reaction. The unique properties of this catalyst effectively synthesize such compounds at room temperature in contrast to all earlier reports. © 2011 Elsevier Ltd. All rights reserved.

Rapid and straightforward one-pot expeditious synthesis of 2-amino-5-alkylidene-thiazol-4-ones at room temperature

Applied Catalysis A: General

Silica grafted polyethylenimine as heterogeneous catalyst for condensation reactions

Silica-immobilized piperazine: A sustainable organocatalyst for aldol and Knoevenagel reactions

Chemical Reviews

Design and Preparation of Organic−Inorganic Hybrid Catalysts

The Journal of Organic Chemistry

Montmorillonite KSF as an Inorganic, Water Stable, and Reusable Catalyst for the Knoevenagel Synthesis of Coumarin-3-carboxylic Acids

A new silica based substituted piperidine derivative catalyzed expeditious room temperature synthesis of homo and hetero bis-Knoevenagel condensation products

Journal	Data powered by TypesetCatalysis Communications
Publisher	Data powered by TypesetELSEVIER SCIENCE BV
ISSN	1566-7367
Open Access	No