886-77-1Relevant academic research and scientific papers
Production of liquid fuel intermediates from furfural via aldol condensation over La2O2CO3-ZnO-Al2O3 catalyst
Fang, Zhen,Kong, Xiao,Lei, Hanwu,Li, Lu-ping,Wei, Xiao-jie
, (2020/11/12)
Aldol condensation of furfural with acetone over basic catalysts allows the production of furanic adducts 4-(2-furyl)-3-buten-2-one (FAc, C8) and 1,5-di-2-furanyl-1,4-pentadien-3-one (F2Ac, C13)) that can be transformed into high-quality diesel
Synthesis of jet fuel intermediates via aldol condensation of biomass-derived furfural with lanthanide catalyst
Cong, Wen-Jie,Fang, Zhen,Kong, Xiao,Li, Lu-ping
, (2021/10/01)
Jet fuel precursors (4-(2-furyl)-3-buten-2-one (FAc) and 1,5-di-2-furanyl-1,4-pentadien-3-one (F2Ac)) can be produced from aldol condensation between furfural and acetone over basic catalysts. However, there is still a need to develop efficient alkaline catalysts and understand the role of alkaline sites. In this work, La2O2CO3-Al2O3 catalyst was successfully prepared by coprecipitation and the effect of preparation conditions on the properties and catalytic performance was investigated. Experiments showed that La2O2CO3 and La2O3 were formed after calcination, and the activity was greatly improved by the introduction of La2O2CO3. At higher coprecipitation pH, rod-shaped La2O2CO3 was formed, which exhibits higher exposure of basic La3+-O2? sites and shows good performance in aldol condensation reactions. The catalytic performance of La2O2CO3-Al2O3 in aldol condensation of furfural with acetone was also evaluated and compared with that of Al2O3, La2O3, La2O3-Al2O3, La(OH)?/Al2O3 and La2O2CO3/Al2O3. A total conversion of furfural can be realized with F2Ac yield of 67.8% at a furfural/acetone ratio of 1/1 and 90 °C, with a FAc yield of 25.8% at the same time. The deactivation mechanism of the La2O2CO3-Al2O3 catalyst was also studied.
High efficiency photoinitiators with extremely low concentration based on furans derivative
Li, Jingfang,Nie, Jun,Sun, Fang,Yang, Fan,Zhao, Xiangchen,Zhong, Meijuan,Zhu, Xiaoqun
, (2020/11/07)
In this paper, two type II photoinitiators (1E,4E)1,5-di(furan-2-yl) penta-1,4-dien-3-one (DFP) and (E)-1,3-di(furan-2-yl) prop-2-en-1-one (DFP-e) were synthesized via Claisen-Schmidt reaction. The maximum peak of absorption could reach about 360 nm and the molar extinction coefficient as high as 4 × 104 M?1 cm?1, it could initiate photopolymerization of HDDA and PEGDA at very low concentration, and the photopolymerization efficiency is much higher than that of ITX at the same concentration. In addition, the synthesized initiators show higher photopolymerization efficiency for PEGDA than that of ITX in the absence of co-initiators as well. On the other hand, the initiators had high rate of photo-bleach exposure upon LED lamp, it could be appropriate for light color and colorless system. With the properties, these initiators could be a promising candidate for UV LED photopolymerization.
The influence of long-term exposure of Mg–Al mixed oxide at ambient conditions on its transition to hydrotalcite: The long-term aging of Mg–Al mixed oxide
Bábelová, Monika,Hájek, Martin,Kocík, Jaroslav,Strejcová, Kate?ina,Ti?ler, Zdeněk,Velvarská, Romana
, (2021/09/08)
The paper is focused on the study of long-term aging of Mg–Al mixed oxides, which causes the rebuilding of the hydrotalcite layered structure in the presence of humidity. The novelty consists in the description of influence during the long-term aging (6 m
Methylene-Linked Bis-NHC Half-Sandwich Ruthenium Complexes: Binding of Small Molecules and Catalysis toward Ketone Transfer Hydrogenation
Botubol-Ares, José Manuel,Cordón-Ouahhabi, Safa,Moutaoukil, Zakaria,Collado, Isidro G.,Jiménez-Tenorio, Manuel,Puerta, M. Carmen,Valerga, Pedro
supporting information, p. 792 - 803 (2021/04/06)
The complex [Cp*RuCl(COD)] reacts with LH2Cl2 (L = bis(3-methylimidazol-2-ylidene)) and LiBun in tetrahydrofuran at 65 °C furnishing the bis-carbene derivative [Cp*RuCl(L)] (2). This compound reacts with NaBPh4 in MeOH under dinitrogen to yield the labile dinitrogen-bridged complex [{Cp*Ru(L)}2(μ-N2)][BPh4]2 (4). The dinitrogen ligand in 4 is readily replaced by a series of donor molecules leading to the corresponding cationic complexes [Cp*Ru(X)(L)][BPh4] (X = MeCN 3, H2 6, C2H4 8a, CH2CHCOOMe 8b, CHPh 9). Attempts to recrystallize 4 from MeNO2/EtOH solutions led to the isolation of the nitrosyl derivative [Cp*Ru(NO)(L)][BPh4]2 (5), which was structurally characterized. The allenylidene complex [Cp*Ru═C═C═CPh2(L)][BPh4] (10) was also obtained, and it was prepared by reaction of 2 with HCCC(OH)Ph2 and NaBPh4 in MeOH at 60 °C. Complexes 3, 4, and 6 are efficient catalyst precursors for the transfer hydrogenation of a broad range of ketones. The dihydrogen complex 6 has proven particularly effective, reaching TOF values up to 455 h-1 at catalyst loadings of 0.1% mol, with a high functional group tolerance on the reduction of a broad scope of aryl and aliphatic ketones to yield the corresponding alcohols.
Synthesis and characterization of functionalized NaP Zeolite@CoFe2O4 hybrid materials: a micro–meso-structure catalyst for aldol condensation
Mortezaei, Zohreh,Zendehdel, Mojgan,Bodaghifard, Mohammad Ali
, p. 2169 - 2193 (2020/01/29)
In this work, magnetic nanocomposite of NaP Zeolite and CoFe2O4 as magnetic nanoparticles (MNP’s) with different ratios were prepared and in the second step functionalized with 2-aminopyridine as a basic group. All samples were characterized by FT-IR, XRD, VSM, FESEM, EDX, TEM, and BET and thermal analyses. The results show that CoFe2O4 MNP’s was dispersed on NaP Zeolite without any significant aggregation with particle size about 30–50?nm. The BET and TEM confirmed the presence of mesoporous phase in the surface of NaP Zeolite/CoFe2O4 and preparation a micro–meso-structure. The NaP Zeolite/CoFe2O4 and NaP Zeolite/CoFe2O4/Am-Py were used as acid–base catalysts for aldol condensation of cyclohexanone with benzaldehyde, and furfural with acetone which produce curcumin and biofuel intermediates, respectively, in solvent-free condition. The effect of different factors such as the percent of CoFe2O4 MNP’s, catalyst amount, solvent, time and temperature was investigated. The catalyst was easily separated with an external magnet and reused four times without significant change in the yield. These catalysts have various advantages including high loading capacity, low leaching for CoFe2O4 MNP’s and simple and efficient recovery procedure which can be used under mild and ecofriendly condition.
Synthesis of tetracyclic oxindoles and evaluation of their α-glucosidase inhibitory and glucose consumption-promoting activity
Dodd, Robert H.,Hao, Lei,Ma, Ying,Ma, Yujiao,Sun, Hua,Yu, Peng,Zhang, Xinying,Zhang, Yinan,Zhao, Lianbo
supporting information, (2020/05/27)
A series of tetracyclic oxindole derivatives was synthesized by asymmetric 1, 3-dipole reaction in 2–4 steps in 57–86% overall yields. These compounds were evaluated for α-glucosidase inhibitory and glucose consumption-promoting activity in vitro. Compound 4l competitively and reversibly inhibited α-glucosidase (IC50 = 3.64 μM) with activity 14-fold higher than that of acarbose. Docking analysis substantiated these findings. In addition, compound 4l exhibited significant glucose consumption promoting activity at 1 μM.
Highly efficient Nb2O5 catalyst for aldol condensation of biomass-derived carbonyl molecules to fuel precursors
Jing, Yaxuan,Xin, Yu,Guo, Yong,Liu, Xiaohui,Wang, Yanqin
, p. 1168 - 1177 (2019/07/09)
Aldol condensation is of significant importance for the production of fuel precursors from biomass-derived chemicals and has received increasing attention. Here we report a Nb2O5 catalyst with excellent activity and stability in the aldol condensation of biomass-derived carbonyl molecules. It is found that in the aldol condensation of furfural with 4-heptanone, Nb2O5 has obviously superior activity, which is not only better than that of other common solid acid catalysts (ZrO2 and Al2O3), more importantly, but also better than that of solid base catalysts (MgO, CaO, and magnesium-aluminum hydrotalcite). The detailed characterizations by N2 sorption/desorption, NH3-TPD, Py-FTIR and DRIFTS study of acetone adsorption reveal that Nb2O5 has a strong ability to activate the C=O bond in carbonyl molecules, which helps to generate a metal enolate intermediate and undergo the nucleophilic addition to form a new C–C bond. Furthermore, the applicability of Nb2O5 to aldol condensation is extended to other biomass-derived carbonyl molecules and high yields of target fuel precursors are obtained. Finally, a multifunctional Pd/Nb2O5 catalyst is prepared and successfully used in the one-pot synthesis of liquid alkanes from biomass-derived carbonyl molecules by combining the aldol condensation with the sequential hydrodeoxygenation.
Preparation of two different crystal structures of cerous phosphate as solid acid catalysts: Their different catalytic performance in the aldol condensation reaction between furfural and acetone
Li, Wenzhi,Su, Mingxue,Yang, Tao,Zhang, Tingwei,Ma, Qiaozhi,Li, Song,Huang, Qifu
, p. 16919 - 16928 (2019/06/24)
Liquid fuel intermediates can be produced via aldol condensation reactions through furan aldehydes and ketones driven from biomass. It was found that cerous phosphate (CP) with two different crystal structures (hexagonal and monoclinic structure), which was tailored by different hydrothermal temperature (120 °C for the hexagonal structure and 180 °C for the monoclinic structure) and calcination temperature (900 °C for the monoclinic structure) as a solid acid catalyst, exhibit high catalytic performance in aldol condensation between furfural and acetone. The CP with hexagonal structure gave 89.1% conversion of furfural with 42% yield of 4-(2-furyl)-3-buten-2-one (FAc) and 17.5% of yield of 1,5-di-2-furanyl-1,4-pentadien-3-one (F2Ac), much higher than CP with monoclinic structure. However, both furfural conversion and aldol product yield increased from 82.3% to 96% and from 50.5% to 68.4%, respectively, for CP with the monoclinic structure after calcination owing to the higher amount of acid of catalyst after calcination but decreased continuously for CP with hexagonal structure after calcination because of its rapidly reduced BET surface area and total pore volume. The results indicated that calcination affects significantly the physical-chemical properties of CP catalysts, which influence subsequently the catalytic performance in the aldol condensation reaction. Recycling experiments showed that the catalytic performance after five number runs for CP with monoclinic structure after calcination was acceptable but was not ideal for CP with hexagonal structure owing to its poor hydrothermal stability.
Acid Catalysts Based on Mesoporous Aromatic Frameworks in Aldol Condensation of Furfural with Some Carbonyl Compounds
Talanova, M. Yu.,Yarchak,Karakhanov
, p. 857 - 864 (2019/08/12)
Aldol condensation of furfural with acetone and a series of aldehydes in the presence of PAF-SO3H acid catalyst based on mesoporous aromatic frameworks was investigated. The reaction course depending on the process temperature, catalyst amount, and reactant ratio was considered for the furfural condensation with acetone as an example. The catalyst can be reused in several cycles without appreciable activity loss.
