Retro-aldol reactions have been implicated as the limiting steps in catalytic routes to convert biomass-derived hexoses and pentoses into valuable C2, C3, and C4 products such as glycolic acid, lactic acid, 2-hydroxy-3-butenoic acid, 2,4-dihydroxybutanoic acid, and alkyl esters thereof. Due to a lack of efficient retro-aldol catalysts, most previous investigations of catalytic pathways involvin...

The catalytic activity and cyclic catalysis of different methyl benzoates were studied by using a series Lewis solid acid catalysts. iron-supported zirconium/titanium catalysts characterized FTIR, SEM, XRD, BET. details verified that the catalyst catalyzed reactions 31 benzoic acids with substituents methanol. In addition, mechanism was revealed according to microstructure, strength, specific s...

A new mechanistic approach for the catalytic, enantioselective conjugate addition of nitrogen-based nucleophiles to acceptor-substituted alkenes is reported, which is based on a visible light induced and phosphate base promoted transfer of a single electron from a nitrogen nucleophile to a catalyst-bound acceptor-substituted alkene, followed by a stereocontrolled C-N bond formation through ster...

5-Hydroxymethylfurfural (HMF) is one of the most important lignocellulosic biomass-derived platform molecules for production renewable fuel additives, liquid hydrocarbon fuels, and value-added chemicals. The present work developed niobium oxides (Nb2O5) supported on mesoporous carbon/silica nanocomposite (MCS), as novel solid base catalyst synthesis HMF via one-pot glucose conversion in a bipha...

A simplistic green and neat procedure was developed for the synthesis of arylmethyl and heteroaryl phosphonates or phosphinates by silica gel supported Lewis acid catalyst, CeCl3.7H2O-SiO2 through Michaelis-Arbuzov reaction under conventional as well as microwave irradiation methods. Herein, tetraalkyl 1,4phenylenebis(methylene)diphosphonates 5(a-d)/dimethyl 1,4-phenylenebis(methylene)bis (phen...

Focusing on the steric and electronic properties of the resonance-stabilized amidine framework, a cationic metal-bisamidine complex was designed as a conjugated combined Lewis-Brønsted acid catalyst. The chiral Zn(II)-bisamidine catalyst prepared from the 2,2'-bipyridyl derived bisamidine ligand, ZnCl₂, and AgSbF₆ promoted asymmetric Mukaiyama aldol reaction of α-ketoester and α,α-disubstituted...

Lewis acid catalyzed isomerization of glucose to fructose is an important reaction for production renewable chemicals. Here, we show the synthesis active and selective catalyst this by controlling Sn dispersion on SBA15. loading 1 wt. % over SBA15 (Sn/SBA15) maximized formation tetrahedral species surface. Increasing or changing support caused SnO2 clusters which reduced selectivity. A mechanis...

A diastereoselective and enantioselective construction of 2,3-disubstituted 1,4-dicarbonyl compounds is reported. Nishiyama's RuPhebox complex (2.0 mol% catalyst loading) serves as a chiral Lewis acid in conjunction with BrCCl3 base for the oxidative homocoupling 2-acyl imidazoles via stereocontrolled reaction intermediate Ru enolates situ brominated imidazoles. Cleavage achiral imidazole auxil...

A novel 3D hexadecanuclear heteropolyoxozincate organic framework, IFMC-200, has been successfully synthesized based on a late transition metal-oxygen cluster. IFMC-200 not only represents the first example of (3,4,24)-connected framework but also contains the first 24-connected single metal cluster in a crystal structure. It exhibits superior thermal stability, good water-stability, and even i...

The conversion of used lubricating oil towards fuel by catalytic is a suitable way to recycle waste oil. Catalyst has key role in conversion. Therefore this research was study the cracking oil, and thus its properties as an alternative for over aluminum fosfate. experiments were carried out batch microreactor at temperature 350-400 oC, atmospheric initial air pressure, 5% w/w catalyst concentra...