@article {44522, title = {Mesoporous shell@macroporous core aluminosilicates as sustainable nanocatalysts for direct N-alkylation of amines}, journal = {Chemnanomat}, volume = {4}, year = {2018}, month = {JUN}, pages = {537-541}, abstract = {

Aluminosilicate spheres with a macroporous core and mesoporous shell (Si/Al ratio of 11) is synthesised by a sol-gel method utilizing cetyltrimethyl ammonium bromide (CTAB) as a structure directing agent in basic medium. The selective incorporation of aluminium in the silica matrix results in the formation of aluminosilicates with an overall acidity of 0.32mmol/g with interconnected pores. Direct N-alkylation reaction is a prototype of C-N bond formation reaction and meso- macroporous aluminosilicate is shown to catalyze this reaction with excellent yield. The catalyst is tested and found sustainable for five catalytic cycles even without any high temperature regeneration step.

}, keywords = {Aluminosilicates, macroporous, Mesoporous, N-alkylation, nanocatalysis}, issn = {2199-692X}, doi = {10.1002/cnma.201800081}, author = {Sekhar, Anandakumari C. Sunil and Ashokkumar, Anumol Erumpukuthickal and Cygnet, Choorapoikayil T. and Lakshmi, Saseendranpillai Vidhya and Deepak, Francis Leonard and Vinod, Chathakudath P.} } @article {47413, title = {Green synthesis of xanthene and acridine-based heterocycles of pharmaceutical importance: a review}, journal = {Environmental Chemistry Letters}, year = {2021}, month = {MAR}, type = {Review; Early Access}, abstract = {

Xanthene and acridine-based heterocyclic compounds find applications in cancer chemotherapy, biological staining and laser dyes and are known for their antibacterial and anti-tumor properties. Here we review green catalytic routes for the synthesis of 1,8-dioxo-octahydroxanthenes, 1,8-dioxo-decahydroacridines and related heterocyclic molecules with catalysts such as metal oxides, mixed metal oxides, resins, supported organocatalysts, heteropolyacids, carbon-based materials, zeolites, sulfides and ionic liquids. We compare protocols for their catalytic activities, and proposed mechanisms are discussed.

}, keywords = {green chemistry, heterocycles, heterogeneous catalysis, Metal oxides, nanocatalysis}, issn = {1610-3653}, doi = {10.1007/s10311-021-01223-w, Early Access Date = MAR 2021}, author = {Burange, Anand S. and Gadam, Komal G. and Tugaonkar, Prajyot S. and Thakur, Seema D. and Soni, Ravish K. and Khan, Rubej R. and Tai, Mubashira S. and Gopinath, Chinnakonda S.} } @article {49917, title = {Synergistic effect of acidic-basic features of copper-doped layered double hydroxides nanocatalysts in valorization of biomass-derived furfural to biofuels}, journal = {ChemPlusChem}, volume = {90}, year = {2025}, month = {DEC}, pages = {e202500416}, type = {Article}, abstract = {

Valorization of biomass-derived chemicals into high-quality compounds and biofuels is enormously fundamental to diminish dependence on fossil-based resources. Furfural is a bio-based valuable compound which can be proficiently upgraded to 4-(2-furyl)-3-buten-2-one (FAc) and 1,4-pentadiene-3-one, 1,5-di-2-furanyl (F 2 Ac) via aldol condensation of furfural with acetone. In the present work, efficient Cu-doped Mg-Al layered double hydroxides (LDH) nanocatalysts are fabricated by coprecipitation and are exploited for furfural conversion to obtained FAc and F 2 Ac. The structure-activity relationship is scrutinized by characterizing fresh and spent nanocatalysts via numerous techniques. The good correlation between the amount of weak acidic-weak basic catalytic sites and nanocatalysts performance is established. The superior performance of Cu-0.1 nanocatalyst (Cu-content = 1.85 wt\%) in aldol condensation is attributed to the presence of optimum weak acidic sites (0.21 mmol g-1) and weak basic sites (0.36 mmol g-1), synergistic acidic-basic effect, nano-sized Cu(OH) 2 nanoparticles (1.6 nm), high BET surface area (181 m2 g-1), and mesoporous architecture of material. Cu-0.1 nanocatalyst delivered 98\% FAc selectivity with 100\% furfural conversion at 85 degrees C. Furthermore, at 100 degrees C, the nanocatalyst gives 55\% F 2 Ac selectivity with 73\% furfural conversion. The catalyst displays good recyclability (7 recycles) and stability. Plausible mechanistic pathway for transformation of furfural to FAc and F 2 Ac is proposed.

}, keywords = {Aldol condensation, biofuels, biomass valorization, nanocatalysis, synergistic effect}, issn = {2192-6506}, doi = {10.1002/cplu.202500416}, author = {Gode, Nilesh G. and Nagpure, Atul S. and Rewatkar, Suresh B. and Bhagat, Shailesh K. and Deshmukh, Ganpat D. and Saini, Ajay} } @article {49960, title = {(NHC-olefin)-nickel(0) nanoparticles: an efficient and selective catalyst for hydrogenation reactions at low temperature and pressure}, journal = {Journal of Catalysis}, volume = {453}, year = {2026}, month = {JAN}, pages = {116487}, type = {Article}, abstract = {

The reduction of a NHC-cinnamyl nickel(II) organometallic complex through the use of different MeMgBr or MeMgCl reagents led to two types of NHC-olefin-coordinated nickel nanoparticles. Both of these unsupported nickel-NHC based nanomaterials behaved under hydrogen pressure as effective and selective catalysts operating at low temperature (\<= 80 degrees C), pressure (\<= 20 bar) and loading (\<= 6 mol\%) for the reductions of broad scopes of alkenes, alkynes, imines and heterocycles, including a challenging tetra-substituted alkene. Among these two nickel-NHC nanocatalysts, the one generated with MeMgCl showed a significant high catalytic activity with high yields and could stand the comparison with Raney nickel and state-of-the-art nickel nanocatalysts. For example, by studying the hydrogenation of 1-phenylcyclohexene in ethanol at 60 degrees C under 10 bar of H2, 3 mol\% of this catalyst achieved the reaction within a single hour on a 5 mmol/0.8 g substrate scale with a yield of 96 \%, a turnover number (TON) of 32 and a turnover frequency (TOF) of 32. Characterizations confirmed the coordination of the NHC-olefin ligands to the nickel nanoparticles, the reduced state of the nickel and the (poly-) crystallinity of the nanoparticles.

}, keywords = {alkenes, Alkynes, heterocycles, Hydrogenation, imines, N -heterocyclic carbene ligand, nanocatalysis, Nickel}, issn = {0021-9517}, doi = {10.1016/j.jcat.2025.116487}, author = {Avello, Marta G. and Singh, Geetika and Truong-Phuoc, Lai and Vidal, Loic and Papaefthimiou, Vasiliki and Chesse, Matthieu and Gruber, Nathalie and Chetcuti, Michael J. and Vanka, Kumar and Ritleng, Vincent and Pham-Huu, Cuong and Michon, Christophe} }