Solvent-free Mechanochemical and Liquid-phase Reaction of [60]Fullerene with Ethyl 2-Diazopropionate

The solvent-free mechanochemical reaction and the liquid-phase reaction of C60 with ethyl 2-diazopropionate prepared in situ or preformed from alanine ethyl ester hydrochloride and sodium nitrite have been investigated. Methanofullerene 1 and fulleroids 2 and 3 from these reactions were obtained, meanwhile the pyrazoline intermediate was not observed. Fulleroids 2 and 3 can be converted to methanofullerene 1 in refluxing toluene.     

OXIDATIVE COUPLING OF METHANE OVER Mn_2O_3-Na_2WO_4/SiO_2 CATALYST Ⅱ.KINETIC STUDY

The kinetics of methane oxidative coupling over Mn_2O_3-Na_2WO_4/SiO_2 catalyst has been studied. Kinetic study carried out under differentconditions gave fractional reaction orders and apparent activation enetgy formethane conversion of 243. 3 kJ/mol.The kinetic results are interpreted via areaction model condsting of Rideal-redox mechanism. Methyl radical andsurface oxygen are assumed as the steady-state intermediates. The constants,k_1, k_2, x and k_3~2/k_4 were obtained fot every temperature. The activity is relatedto k_1 and k_2, while the selectivity (C_2/C_1) is related to k_3~2/k_4.     

酚酞作为探针研究水溶液中β-环糊精与低分子脂肪醇的互相作用

用环糊精(β-CD)分子内空腔模拟酶的疏水结合位,是目前酶模型化合物研究中的一个重要方面。Yoshihisa Matsui曾用偶氮染料(4-羟基-1-萘偶氮4-萘碘酸钠I)作为探针,测定不同结构和链长的脂肪醇在弱酸性(PH=6.4)     

天然高分子负载型钯催化剂的表征及在催化苯乙烯氢酯基化反应中的重复使用

用SiO2担载壳聚糖（简写为CS），再负载PdCl2，制得催化剂SiO2-CS-PdCl2，其在苯乙烯及其衍生物的氢酯基化反应中表现出了较高的催化活性和选择性。XPS和TEM数据表明，催化剂的活性组分颗粒以纳米尺寸均匀地分布在载体表面，而且载体CS对金属钯有明显的配位作用。在反应体系中加入少量对苯醌，可防止钯聚集成钯黑沉淀而使催化剂失活，改善催化剂的重复使用效果。     

Studies on the Phenylfluorone-Mo(Ⅵ) Complex as Interacting Mode Spectroscopic Probe of Protein in OP Microemulsion Medium

The application of phenylfluorone (PF)-Mo(VI) complex as a spectroscopic probe is studied. In the presence of OP microemulsion at pH 3.04, PF-Mo(Ⅵ) complex combines protein rapidly to form a stable compound and the absorbance at 527 nm is in proportion to the concentration of protein in the range 0-16 μg mL-1 for bovine serum albumin (BSA). OP microemuslion media is introduced into protein determination, it has increased markedly the sensitivity of the system. The molar absorption coefficient was 5.98×l06 L mol-1 cm-1 for BSA. The assay, with sensitivity, simplicity and tolerance to many foreign substances, is applied to the determination of protein in samples with satisfactory results. Moreover, the binding number of BSA with the complex, which is determined by molar ratio and slope ratio methods, is in good agreement.     

Ceric Ammonium Nitrate-mediated Oxidative Cycloaddition of 1,3-Dicarbonyls to β-Aryl-α,β-unsaturated Ketones

Regio and stereoselective synthesis of substituted dihydrofurans were accomplished by ceric ammonium nitrate mediated oxidative cycloaddition of 1,3-dicarbonyls to β-aryl-α,β-unsaturated ketones in moderate yields.     

苯并-15-冠-5取代的有机硅化合物的合成及其性能

我们提出了一条合成含有苯并-15-冠-5取代基的某些有机硅冠醚化合物的简易路线。通过Wittig反应合成的4'-乙烯基苯并-15-冠-5,经过双键上的硅氢加成反应,得到几种新型含有冠醚基团的有机硅烷或氯硅烷。后者可以进一步烷氧基化或者水解成冠醚取代的聚有机硅氧烷。此外,还测定了它们对碱金属离子的络合容量和作为相转移催化剂的能力。     

Oxidative Coupling of Methane over Na-W-Mn/Si0_2 Catalysts at Elevated Pressures

Na-Mn-W/SiO2 catalysts were studied for the oxidative coupling of methane (OCM) in a micro fixed bed reactor made of stainless steel reactor at elevated pressures. The effect of operating conditions, such as GHSV, pressure, temperature and CH4/O2 ratio on the catalytic performance of OCM was investigated. The C2+ selectivity of 80.3% was obtained at a CH4 conversion of 16.1% at 750℃, 1.5×105h-1 GHSV, and 0.6 MPa. Also, there is a small output of C3 and C4 hydrocarbons in the tail gas. The results show that unfavorable effects due to elevated pressure can be overcome by increasing GHSV, and the OCM reaction is strongly dependent on the operating conditions at elevated pressures, particularly GHSV and the CH4/O2 ratio.     

Novel Fréchet-type dendritic BINOL ligands and their applications in Ti(IV) complex catalyzed asymmetric addition of diethylzinc to aldehydes

New Fréchet-type dendritic BINOL ligands bearing several BINOL units at the periphery have been successfully synthesized. The (dendritic BINOL) Ti(Ⅳ) complexes were proved to be efficient catalysts for the enantioselective addition of diethylzinc to aromatic aldehydes.Moreover,these ligands could be quantitatively recovered and reused at least five times without a loss of the yield and enantioselectivity.     

Cerium(Ⅳ) ammonium nitrate(CAN) initiated O-alkylation of oximes with N-vinyl lactams

O-Alkylation of oximes with N-vinylpyrrolidin-2-one or N-methyl-N-vinylacetamide was efficiently initiated by a catalytic amount of cerium(Ⅳ) ammonium nitrate(CAN),giving the corresponding oxime ether derivatives in good yield.