Synthesis and characterization of SAPO-11 molecular sieves from alcoholic systems

Summary SAPO-11 molecular sieves were synthesized from aqueous and nonaqueous systems by using different alcoholic solvents and their physicochemical properties were compared. The SAPO-11 samples synthesized from alcoholic systems had larger external surface area, higher Si contents and higher acidity than those of the sample synthesized from the aqueous system. Thereby, loaded with 0.5 wt.%Pt, the resulting Pt/SAPO-11 catalysts synthesized from alcoholic systems exhibited higher catalytic activities and selectivity for n-dodecane hydyroisomerization. Among the catalysts synthesized from alcoholic systems, the Pt/SAPO-11 catalyst synthesized from polybasic alcohol systems possessed the highest catalytic activities.     

Synthesis and pharmacological activity evaluation of curcumin derivatives

Curcumin 3,4-dihydropyrimidinones/thiones/imines have been synthesized using one-pot cyclocondensation of curcumin with substituted aromatic aldehydes and urea/thiourea/guanidine in the presence of chitosamine hydrochloride as a biodegradable and nontoxic catalyst under solvent-free microwave irradiation. The synthesized product was purified by crystallization from ethanol and the process does not involve any hazardous solvent. All the synthesized curcumin derivatives 4a-o were screened for antioxidant and anti-inflammatory activity. Biological activity data of the synthesized showed that most of the synthesized compounds exhibited greater antioxidant and anti-inflammatory activity than curcumin.     

汽车空调器压缩机用冷冻机油的研究

采用三氟化硼乙醚 (BF3·Et2 O)催化体系合成较高粘度的环氧丙烷均聚醚 ,观察了不同反应参数对聚醚粘度的影响。同时考察了不同催化剂对聚醚酯性能的影响。结果表明 ,用固体钨硅酸合成的聚醚酯较对甲苯磺酸的性能好     

Thermal analysis applied for the removal of surfactant from mesoporous molecular sieves MCM-41 synthesized from gold mine tailings slurry

The aim of the current study is to obtain the thermal behavior and kinetic analyses of the removal of surfactant from MCM-41 synthesized from tailings slurry at different heating rates. X-ray diffraction and thermogravimetric analyses were carried out to determine the characterization of the synthesized samples. Kissinger–Akahira–Sunose and Friedman isoconversional kinetic methods were applied for the purpose of determining the kinetic analysis parameters of the decomposition of surfactant from the mesoporous molecular sieves MCM-41 under non-isothermal conditions. For the comparison of these results, MCM-41 was synthesized from a pure silica source. The thermal behaviors of MCM-41 synthesized from tailings slurry do not differ from samples synthesized from pure silica during the decomposition reactions. The kinetic analysis’ results indicate that the decomposition reactions of the synthesized MCM-41 samples had complex reaction mechanisms.     

MCM-48介孔分子筛的高压合成

采用正硅酸乙酯（TEOS）作硅源,十六烷基三甲基溴化铵（CTAB）为模板剂,在高压 （约7 MPa）和373 K下合成了MCM-48介孔分子筛.用XRD、氮气吸附及29Si MAS NMR对样品 进行了表征.与常压合成的相比,高压下合成的MCM-48具有更高的热稳定性和水热稳定性.2 9Si MAS NMR结果表明,高压有利于分子筛孔壁的聚合,导致分子筛结构更加完善,从而使 其具有更高的稳定性.     

Synthesis of newly cationic surfactant based on dimethylaminopropyl amine and their silver nanoparticles: Characterization; surface activity and biological activity

The chemical structure of newly synthesized cationic surfactants based on Schiff base was confirmed using Fourier transform infrared spectroscopy, proton nuclear magnetic resonance spectroscopy, and mass spectroscopy. The synthesized surfactants were used in the synthesis of silver nanoparticles by a simple one-step method. The silver nanoparticle (AgNPs) formation was confirmed using transmission electron microscopy (TEM), electron diffraction (SAED), dynamic light scattering (DLS), and energy dispersive X-ray spectroscopy (EDX). The structure of the surfactant played an important role in the synthesis process. Increasing the hydrophobic chain length, the stability, and the amount of surfactant increased the quantity of AgNPs formed. The surface activity of the synthesized cationic surfactants was determined using surface tension measurements at three different temperatures. The synthesized surfactants showed a high tendency toward adsorption and micellization. Increasing the hydrophobic chain length of the synthesized surfactant increased its adsorption. Screening the synthesized cationic surfactants and their nano-form against bacteria and fungi showed that they are highly effective. The silver nanoparticles enhanced the biological activity of the synthesized cationic surfactants.     

Convenient One Pot Synthesis and Antibacterial Evaluation of Some New Mannich Bases Carrying 1,2,4‐Triazolyl Moiety

A series of Mannich bases were synthesized by a three‐component Mannich reaction. The newly synthesized compounds were well characterized by elemental analyses, IR, NMR and mass spectroscopic studies. The potential antibacterial effects of the synthesized compounds were investigated using standard bacterial strains: Gram‐positive and Gram‐negative bacteria. Interestingly, all the synthesized compounds were observed to be promising leads, possessing moderate to significant inhibitory activity as compared to standard.     

Optically active polyamidoimides based on amino acids containing cyclohexane fragment

New amino carboxylic acids containing a cyclohexane fragment and an L-leucine or L-valine fragment were synthesized. The reactions of the synthesized amino acids with 4,4′-oxydiphthalic anhydride gave in quantitative yields the dicarboxylic acids, which were converted to the corresponding dichlorides. Low-temperature polycondensation of the synthesized dichlorides with 4,4′-diaminodiphenyl ether yielded optically active polyamidoimides, which are soluble in various organic solvents and exhibit enhanced heat resistance. The structures of the synthesized monomeric compounds and polymers were confirmed by elemental analysis, IR and ¹H NMR spectroscopy, and high-resolution mass spectrometry. Specific rotation angles of the synthesized amino carboxylic acids and polyamidoimides were determined.     

Transition-metal-catalyzed group transfer reactions for selective C-H bond functionalization of artemisinin

Three types of novel artemisinin derivatives have been synthesized through transition-metal-catalyzed intramolecular carbenoid and nitrenoid C-H bond insertion reactions. With rhodium complexes as catalysts, lactone 11 was synthesized via carbene insertion reaction at the C16 position in 90% yield; oxazolidinone 13 was synthesized via nitrene insertion reaction at the C10 position in 87% yield based on 77% conversion; and sulfamidate 14 was synthesized via nitrene insertion reaction at the C8 position in 87% yield.     

双环戊二烯开环歧化聚合反应及合成聚合物性能研究

采用WCl6－ArOH／Et2AlCl（ArOH：2，6-二叔丁基对甲苯酚）催化体系进行了双环戊二烯的开环歧化聚合反应，考察了单体纯度以及催化体系支载化对聚合反应和合成聚合物性能的影响。在极限聚合浓度下，研究了单体与主、助催化剂摩尔比等因素对聚合反应及合成聚合物性能的影响。实验结果表明：单体纯度越高所得聚合物的机械性能越好；催化体系经聚合物支载化后能显著提高催化体系的催化聚合活性及合成聚合物的机械性能。     

Synthesis of some novel thiocyanotopurine derivatives and investigation of their antimicrobial activity and DNA interactions

A series of 6-thiocyanatopurine derivatives introduced with different alkyl groups in position 9 was synthesized. The structures of the synthesized compounds were evaluated via spectroscopic methods and elemental methods of analyses. All the synthesized compounds were screened for their antibacterial activities against Gram-positive and Gram-negative bacteria and for their antifungal activities against yeast strains. All the synthesized compounds showed better antibacterial activities against Gram-positive bacteria compared to Gram-negative bacteria. DNA interactions with pBR322 DNA were determined. Most of the compounds caused conformational changes in DNA.     

A factor from granulosa cells can stimulate oocyte tissue plasminogen activator activity

Several studies indicate that substances synthesized by granulosa cells are capable of regulating oocyte activity. We have studied the effect of factors synthesized by granulosa cells on tPA activity of denuded oocytes using a co-culture system. The results show that an FSH-dependent factor(s) synthesized by granulosa cells (but not by theca-interstitial cells) is capable of stimulating tPA activity of denuded oocytes. This finding is important for understanding hormonal regulation of oocyte tPA activity by mediators synthesized in granulosa cells.     

Annealing dependent synthesis of cyto-compatible nano-silver/calcium hydroxyapatite composite for antimicrobial activities

Crystalline hydroxyapatite were synthesized from synthetic/human urine through precipitation which were further doped with silver nanoparticle for effective biomedical application. The aim were to improve overall biological compatibility of the synthesized bone-graft material even in oncogenesis cases. The thermal calcinated material was characterized by several techniques including UV–vis, Laser Raman, Fourier transmittance infrared spectroscopy, X-ray diffraction analysis, Transmission Eelectron microscopy and X-ray fluorescence spectroscopy. The quantitative and qualitative analysis revealed that the synthesized material was highly crystalline and nanosized with majority of silver and phosphate components. The antibacterial, anticancer and invitro cytotoxicity of the synthesized material was evaluated with Escherichia coli, Hela cells and brine shrimp assay, respectively. The brine shrimp assay revealed that the synthesized material is compatible with biological system, whereas anticancer activity showed the application of the synthesized biomaterial in cancer treatment in which antibacterial activity adds more advantage on preventing the bone-graft from microbial attack.     

A FACTOR FROM GRANULOSA CELLS CAN STIMULATE OOCYTE TISSUE PLASMINOGEN ACTIVATOR ACTIVITY

Several studies indicate that substances synthesized by granulosa cells are capableof regulating oocyte activity. We have studied the effect of factors synthesized by gran-ulosa cells on tPA activity of denuded oocytes using a co- culture system. The resultsshow that an FSH- dependent factor(s) synthesized by granulosa cells (but not by theca-interstitial cells) is capable of stimulating tPA activity of denuded oocytes. This findingis important for understanding hormonal regulation of oocyte tPA activity by mediatorssynthesized in granulosa cells.     

分子印迹聚合物的制备及其对香草醛的吸附行为

以香草醛为模板分子、甲基丙烯酸为功能单体、乙二醇二甲基丙烯酸酯为交联剂,制备了香草醛分子印迹聚合物(MIP);研究了以不同致孔剂合成的MIP在水溶液中对香草醛的吸附行为.结果表明,以乙腈为致孔剂合成的MIP对香草醛具有较高的识别特性,能较简便地用于香草醛的分离和富集.     

Synthesis and intramolecular heterocyclization of <Emphasis Type="Italic">n</Emphasis>-allylthiocarbamide derivatives of the alkaloids cytisine and anabasine into 1,3-thiazoline derivatives and features of their molecular structures

Allylthiourea derivatives were synthesized from the alkaloids cytisine and anabasine and allylisothiocyanate. 1,3-Thiazoline derivatives were synthesized from them via intramolecular heterocyclization using HCl and heating in a sealed ampul. The structures of the synthesized compounds were proved by IR and PMR spectroscopy, mass spectrometry, and x-ray structure analysis.     

Synthesis of New 1,3‐Benzoxazines from Ketimines and Their Bioevaluation

A new series of 1,3‐Benzoxazines were synthesized from ketimines and triphosgene. The synthesized compounds were characterized by IR, ¹HNMR, and mass spectral data. The synthesized compounds on bioevaluation indicated significant antifungal activity.     

Preparation,structure elucidation,and antioxidant activity of new bis(thiosemicarbazone) derivatives

Schiff-base–bearing new bis(thiosemicarbazone) derivatives were prepared from terephthalaldehyde and various thiosemicarbazides. FT–IR, ¹H NMR, ¹³C NMR, and UV–Vis spectroscopic methods and elemental analysis were used to elucidate the identification of the synthesized molecules. The in vitro antioxidant activity of the synthesized compounds was analysed with the 1,1-diphenyl-2-picryl hydrazyl free-radical–trapping process. The synthesized compounds exhibited lower antioxidant activity than the standard ascorbic acid. IC₅₀ values of the synthesized molecules measured from 3.81 ± 0.01 to 29.05 ± 0.11 μM. Among the synthesized compounds, compound 3 had the best antioxidant activity. Moreover, this study explained the structure–activity relationship of the synthesized molecules with different substituents in radical trapping reactions.     

Preparation ways and photoluminescence of mesoporous alumina

High specific surface area (SSA) mesoporous alumina (MA) is synthesized by a sol-gel method using pelagic clay as the raw material. The MA synthesized with a (1-hexadecyl) trimethylammonium bromide (CTAB): utea mixed template shows a SSA of 385.56 m²/g and a mean pore size of 3.6 nm. And the SSA of the MA synthesized with the mixed template is increased compared with the MA synthesized with a CTAB single template. Simultaneously, the MA exhibits a blue photoluminescence which come from the defect F⁺ and F centers, and the higher PL emission of the MA synthesized with a CTAB: utea mixed template is attributed to the high defect center density in the MA.     

树枝状偶氮液晶高分子(PAMAM-MMAZO)的合成及表征

树枝状偶氮液晶高分子(PAMAM-MMAZO)的合成及表征;树枝状聚酰胺-胺;树枝状偶氮液晶;表面修饰;液晶性