@article {48420, title = {Cobalt-immobilized carbon-based nano-catalyst for Csingle bondN cross coupling reaction}, journal = {Results in Chemistry}, volume = {4}, year = {2022}, month = {JAN}, pages = {100682}, type = {Article}, abstract = {

Csingle bondN\ cross coupling reaction\ is very important in synthesis of pharmaceuticals,\ natural products,\ agrochemicals, fine chemicals and functional materials. Traditionally,\ palladium\ or copper metals are used for Csingle bondN coupling reaction. As palladium is expensive, we developed cobalt immobilized carbon-based nano-catalyst Co@CC for Csingle bondN coupling. In this work, we synthesized non-noble metal-based Co@CC nano-catalyst by\ carbonization\ of glucose, it{\textquoteright}s functionalization followed by immobilization of cobalt on the surface of the catalyst. The catalyst was well characterized. The Csingle bondN cross coupling reaction of various aryl\ halides\ \& amines using Co@CC nano-catalyst was optimized for solvent, reaction temperature \& catalyst\ concentration conditions. The catalyst showed high catalytic activity for Csingle bondN coupling of various aryl halides \& amines to form aryl amines in good to excellent yield up to 91\ \% in\ sulfolane\ as a solvent at 150\ {\textdegree}C. The catalyst showed recyclability up to 5 times. The method developed for Csingle bondN coupling reaction was noble metal free, ligand free, recyclable, sustainable, economical \& environmentally friendly.

}, doi = {10.1016/j.rechem.2022.100682}, author = {Bankar, Shubham R. and Kirdant, Swapnali P. and Jadhav, Vrushali H.} } @article {48034, title = {Metal-free approach towards efficient synthesis of FDCA using a p-toluene sulfonic acid (p-TSA)-derived heterogeneous solid acid catalyst and oxone over two steps from HMF, fructose and glucose}, journal = {New Journal of Chemistry}, volume = {46}, year = {2022}, month = {MAY}, pages = {10272-10279}, type = {Article}, abstract = {

In this work, a metal-free approach towards the synthesis of 2,5-furandicarboxylic acid (FDCA) from 5-hydroxymethylfurfural (HMF), fructose and glucose is reported over two steps using a p-toluene sulfonic acid (p-TSA)-derived heterogeneous solid acid catalyst (p-TSA-POM) in the first step and oxone as an oxidant in the second step. HMF, fructose and glucose were converted to 2,5-diformylfuran (DFF) using the p-TSA-POM catalyst followed by oxidation of DFF to FDCA using oxone. To the best of our knowledge, this is the first metal-free approach for the synthesis of FDCA directly from glucose. DFF was obtained from HMF in 91\% yield, whereas it was obtained in 85\% and 61\% yields from fructose \& glucose, respectively. DFF was further converted to FDCA using oxone as an oxidant. FDCA was obtained in an overall yield of 84\%, 78\% and 56\% from HMF, fructose \& glucose, respectively.

}, issn = {1144-0546}, doi = {10.1039/d2nj01207c}, author = {Tamboli, Asma T. Biradar and Kirdant, Swapnali P. and Jadhav, Vrushali H.} } @article {47992, title = {Recent developments in the applications of biomass-derived sulfonated carbonaceous solid acid catalysts}, journal = {Helvetica Chimica Acta}, volume = {105}, year = {2022}, month = {AUG}, pages = {e202200032}, type = {Review}, abstract = {

Recently, carbon-based materials are gaining a lot of attraction. It is considered as an emerging area of research and has gained significant importance as an efficient catalyst/material in various fields. Biomass is abundantly available, cheap and a renewable carbon resource. Sulfonated carbonaceous solid acid catalyst can be derived by sulfonation of various sources of biomass such as sugars, lignin, fruit waste, agro-waste, bio-char, etc. Sulfonated carbonaceous solid acid catalysts can be used as a substitute to liquid acids. These catalysts possess a stable carbon skeleton and are insoluble in almost all organic solvents as well as under acidic/basic conditions. This review covers details about biomass-derived sulfonated carbonaceous solid acid catalysts and its catalytic activities in many important transformations such as hydrolysis of cellulose, synthesis of biodiesel, synthesis of various important chemicals and for various organic transformations.

}, keywords = {Biodiesel, Biomass, cellulose, Hydrolysis, sulfonated carbonaceous solid acid catalyst}, issn = {0018-019X}, doi = {10.1002/hlca.202200032}, author = {Kirdant, Swapnali P. and Tamboli, Asma T. Biradar and Jadhav, Vrushali H.} } @article {49222, title = {Direct oxidation of alcohols to carboxylic acids using simple and economical Pd@Glu-HTC catalyst: practical and scalable approach towards biomass based value added chemicals}, journal = {Biomass \& Bioenergy}, volume = {187}, year = {2024}, month = {AUG}, pages = {107290}, type = {Article}, abstract = {

Sustainable catalytic transformation of bio-based alcohols to high value-added fine chemicals is an important topic of research. This work described preparation of simple and economical Pd@Glu-HTC catalyst from biomass derived low cost D-glucose. Hydrothermal carbonization of glucose was carried out in first step to synthesize GluHTC support in a simpler, greener, economical and efficient manner followed by incorporation of palladium metal on surface of the catalyst in second step. The catalyst was characterized using techniques such as Fourier Transform Infrared Spectroscopy (FT-IR), Solid-state Cross-Polarization Magic Angle Spinning Carbon-13 (13C CPMAS), Energy-dispersive X-ray spectroscopy (EDAX), Powder X-ray diffraction (P-XRD), X-ray photoelectron spectroscopy (XPS), Thermogravimetric/Differential Thermal Analyzer (TG-DTA), Field emission scanning electron microscopy (FE-SEM) and High-resolution transmission electron microscopy (HR-TEM). The catalyst was evaluated for direct oxidation of alcohols to yield carboxylic acids and exhibited very good catalytic activity for wider substrate scope. Oxidation of alcohols was carried out using milder base, molecular oxygen and water as a solvent to achieve 92-99 \% excellent yields. The practical utility of current strategy was also studied for gram scale synthesis of bio-based value added industrially important chemicals such as furoic acid (flavouring agent and preservative in industry), 2, 5-furan-dicarboxylic acid (monomer to 100 \% fossil-free, recyclable polymer polyethylene furanoate (PEF), tetrahydro-2-furoic acid (production of many drugs) and vanillin (important product of flavor and fragrance industry). Pd@Glu-HTC catalyst was found to be reusable for four recycles and the catalytic performance was retained without any loss in its activity after four cycles.

}, keywords = {Bio-based chemicals, Carbonaceous catalyst, Carboxylic acid, Oxidation}, issn = {0961-9534}, doi = {10.1016/j.biombioe.2024.107290}, author = {Kirdant, Swapnali P. and Bankar, Shubham R. and Jadhav, Vrushali H.} }