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In contrast to the recent reports on catalytic hydroboration of amides to amines with pinacolborane (HBpin), a simple catalyst-free and solvent-free method for the hydroboration of a variety of amides has been realized. To get the mechanistic insights, DFT calculations have been performed.
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http://dx.doi.org/10.1039/d1cc04148g | DOI Listing |
Nanoscale
August 2025
Department of Chemistry, Malaviya National Institute of Technology Jaipur, Rajasthan-302017, India.
Developing efficient and sustainable catalytic systems for carbon dioxide utilization is crucial in tackling the challenges posed by increasing greenhouse gas emissions. This study investigates the co-catalyst- and solvent-free cycloaddition of CO with epoxides using a series of iron-based metal phosphonates, FePPA (iron phenylphosphonate), FeHEDP (iron hydroxyethylidene diphosphonate), and FeEDTMP (iron ethylenediamine tetramethylene phosphonate), with the aim of elucidating the role of acidic-basic sites in enhancing their catalytic performance. These catalysts, prepared using phosphonic acids with various functional groups, offer a platform for examining how structural modifications influence CO fixation efficiency.
View Article and Find Full Text PDFChem Biodivers
July 2025
Department of Chemistry, Aligarh Muslim University, Aligarh, India.
A sustainable, catalyst-free and solvent-free method for the synthesis of 1,4-dihydropyrano[2,3-c]pyrazoles was developed using visible blue light-emitting diode (LED) light (24 W) under ambient conditions. The reaction proceeds via an electron donor-acceptor (EDA) complex mechanism, achieving excellent yields (80%-99%) within 30 min without requiring hazardous reagents. Structural characterization of the synthesized compounds (4a-4k and 5a-5k) was confirmed through H NMR, C NMR, IR, MS and single-crystal x-ray diffraction (XRD).
View Article and Find Full Text PDFBeilstein J Org Chem
July 2025
Department of Chemistry, University of Massachusetts Boston, 100 Morrissey Blvd, Boston, MA, USA.
High hydrostatic pressure (HHP) was found to be an efficient activation method in several catalyst- and solvent-free reactions and has found application for the syntheses of heterocycles and the preparation of active pharmaceutical ingredients (APIs) via acylation and acid- and solvent-free esterification. The reactions were carried out at ambient pressure (control) and under HHP (up to 3.8 kbar) conditions.
View Article and Find Full Text PDFACS Appl Mater Interfaces
July 2025
School of Chemical Engineering and Technology, Sun Yat-sen University, Zhuhai, Guangdong 519082, P. R. China.
The efficient and sustainable conversion of carbon dioxide (CO) into value-added chemicals represents a promising approach for addressing environmental and energy challenges. Herein, we report the design and synthesis of a series of ionic liquid-functionalized covalent organic frameworks, [DD]-PB-COF (X = 25, 50, 75, 100), via postsynthetic modification of hydroxyl-containing COFs using triethylenediamine-based ionic liquids. The resulting materials exhibit high crystallinity, tunable active site density, and well-defined one-dimensional channels conducive to CO mass transport.
View Article and Find Full Text PDFMacromolecules
March 2025
Institute of Polymer Chemistry, Johannes Kepler University Linz, Altenberger Straße 69, 4040 Linz, Austria.
Silicone elastomers are commonly cured by hydrosilylation or condensation reactions, both of which require metal-based catalysts. Due to environmental, toxicological, and cost concerns, there is considerable interest in developing metal-free alternatives. Herein, we present a novel solution via an atom-efficient, catalyst-free ring-opening of poly(2-isopropenyl-2-oxazoline) (PiPOx) as a curing agent.
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