Reaction of Polymer-supported Selenovinyl Bromide with Grignard Reagents: A Facile Route to the Synthesis of (E)-1, 2-Disubstituted Olefins

Polymer-supported selenovinyl bromide, easily prepared from polymer-supported selenenyl bromide with acetylene, reacts with different Grignard reagents using a step-by-step strategy to obtain （E）-1, 2-disubstituted ethenes in good yields.

POLYMER-SUPPORTED GRIGNARD REAGENT AND ITS USE IN THE FUNCTIONALIZATION OF POLYMER

Polymeric Grignard Reagent (PGR) based on the chloromethylated poly(ST-co-DVB) resinhas been prepared by means of anthracene-magnesium complex in THF (Anth-Mg-THF), andpolymer matrix with long polymethylene spacer was synthesized via the coupling reaction betweenPGR and α, ω-dibromoalkanes. Based on the studies of factors affecting the coupling, such ascatalyst,reaction time,the length of spacer etc.,this paper offers the optimal reaction conditionsand three typical experiment procedures. The mechanism for the formation and coupling reactionof PGR are also discussed.

Synthesis of a New Polymer-supported Reagent──Poly{[4- hydroxy(tosyloxy)iodo]styrene} and Its Application to the Synthesis of 2-Amino-4-arylthiazoles

A new polymer-supported reagent--poly{[4-hydroxy(tosyloxy)iodo]styrene} has good reactivity in the formation of 2-amino-4-arylthiazoles, and the procedure of regeneration and cycle are also described.

A New Type of Polymer-Supported Metallocene Catalyst for Ethylene Polymerization

A new polymer-supported metallocene catalyst has been prepared, The polymer-supported metallocene displayed considerably high activity in ethylene polymerization, the highest being 3.62x10(7) gPE/molZr.h, the molecular weight of the polyethylene produced was Mn = 1.29x10(5). about 3-4 times those of corresponding homogeneous zirconocenes. The polymer-supported metallocene keeps the characteristics of homogeneous metallocene catalysts, and offers some features, such as adaptable to gas phase and slurry processes: easy to prepare in low cost: relatively high activity and lower MAO/Zr ratio; lower inorganic residues in the polyolefins as compared to cases of SiO2, Al2O3 or MgCl2; unitary active structure, no complex surface as with SiO2; good control of morphology of the resulting polymer.

Synthesis and Catalytic Activities of Polymer-Supported Neodymium Complexes——Polymers Containing Thiol and Sulphoxide

The neodymium complexes with crosslinked polystyrene containing -CH2SH and -CH2SOCH3 groups, P-CH2SH . NdCl3 and P-CH2SOCH3. NdCl3, were prepared. P-CH2SH . NdCl3 shows no catalytic activity for butadiene polymerization, while P-CH2SOCH3. NdCl3 can catalyze the polymerization of butadiene. The content of cis-1,4-polybutadiene is more than 95%.

Synthesis of Polymer-Supported Heteronuclear Rhodium- Cobalt Bimetallic Carbonyl Cluster Catalysts and Their Hydroformylation Properties

Tetranuclear Rh-Co bimetallic cluster was synthesized and characterized by IR and XPS. The properties of the anchored catalysts, its stability and the ligand effect were also studied. The experimental results show that the optimal conditions for the hydroformylation of hexene-1 are as follows: the temperature is 80℃, reaction time 8 h, pressure 5. 88×105 Pa, and molar ratio of H2/CO 1. 2/1. 0. Functional groups attached to the donor atom(N) possess more or less some influence on the catalytic behavior. Compared with the homogeneous cluster, the polymer-supported bimetallic cluster is more stable. After the catalytic reaction, the structure of the anchored catalysts was not destroyed. X-ray photoelectron spectroscopy characterization indicates that there is a weak interaction between the polymer support and the active metals.

POLYMER-SUPPORTED RARE EARTH CATALYSTS FOR STYRENE POLYMERIZATION

The neodymium complex supported on styrene-maleic anhydride copolymer (SMA·Nd) has been prepared for the first time and found to be a highly effective catalyst for the polymerization of styrene. The SMA·Nd polymeric complex is characterized by IR and its catalytic activity, and the polymerization features have been investigated in comparison with that of the conventional Ziegler-Natta catalysts. When [Nd]=1×10^(-3) mol/L, [M]=5mol/L, Al/Nd=170(mol ratio) and CCl_4/Nd=50(mol ratio), the polymerization conversion of styrene gets to 51.6% in six hours, and the catalytic activity reaches 1852 gPS/gNd, which is much higher than that of conventional rare earth catalysts. The polymerization reaction has an induction period and shows some characteristics of chain polymerization. The polymerization rate is the first order with respect to the concentration of styrene monomer. Addition of FeCl_3 does not suppress the polymerization.

SYNTHESIS AND CATALYTIC PROPERTY OF POLYMER-SUPPORTED Fe-Co HETEROTETRAMETALLIC CLUSTERS

Four polymer-supported Fe-Co tetrametallic clusters have been prepared by ion exchange and ligand exchange. Their structures were characterized by IR, UV/visible diffuse reflectance spectra and elemental analysis, and by analogy with the reference cluster PhCH_2NMe_3FeCo_3 (CO)_2 . The four heterogenous clusters were efficient catalysts in the hydroformylation of 1-hexene, turnover numbers amounted to 823 — 924 with the yield of 83.2—92.4% heptyl aldehydes and ratios of normal aldehyde to iso-aldehyde of 1.2—1.6, they are facilitated forming the normal aldehyde in comparison with the homogeneous analogue. For the polymer-supported clusters prepared by ion exchange, the polymer-cation parts had no obvious effect on the activity of the cluster anion. The polymer-phosphine substituted cluster prepared by ligand exchange was more stable than the clusters preparedby ion exchange.

ASYMMETRIC HYDROSILYLATION CATALYZED BY POLYMER-SUPPORTED THIAZOLIDINE RHODIUM CATALYSTS

Asymmetric hydrisilylation catalyzed by polymeric thiazolidine rhodium catalystswas conducted. Almost the same optical yields have been obtained when comb-shapedpolymeric ligands and their corresponding monomer complexed rhodium cataltystswere used to asymmetric hydrosilylation of acetophenone. Optical yield of chira 1- methylbenzyl alcohol reaches as high as 71.5%. Temperature dependence of enantio- selective hydrosilylation of acetophenone was discussed.

DESIGN OF POLYMER-SUPPORTEDCHIRAL CATALYSTS

Some structural factors to the design of polymer-supported Chiral Catalysts arediscussed, and some new approaches for designing of polymer-supported catalysts arereviewed in this paper

POLYMER-SUPPORTED SINGLE AND MIXED AMMONIUM AND PHOSPHONIUM SALTS AS CATALYSTS FOR PHASE-TRANSFER REACTIONS

In this study was to investigate, by phase-transfer catalysis, the activity of single and mixed ammonium and phosphonium salts grafted on a 揼el-type?styrene-7% divinylbenzene copolymer in the oxidation of benzyl alcohol with hydrogen peroxide. A wide variety of catalysts with different quaternary groups and different quaternary chain length substituents were examined. The activity of single 搊nium?salts increases as a consequence of the association of ammonium and phosphonium salts grafted on the same polymeric support. The activity of polymer-supported ammonium and phosphonium salts increases with the number of carbon atoms contained in the alkyl radicals of the onium and of the functionalization degree with phosphonium groups.

Effect of reagent films on coupling relationship between glass surface and particles

The experiments were conducted to investigate the behavior of airborne particles adhering to the glass slides which were coated by several reagent films. The results showed that the adhesion level could be significantly changed by the reagent films. There were no evident rules between the average size of particles and sampling time interval, the placing angle and reagent concentration. The average particle size on the surface coated by composite reagent （2-3 μm） was smaller than that on the single reagent coated surface, while the largest particle size （4-5 μm） was observed on the surface coated with the Tween 60. The experiment also demonstrated that the best adhesive performance was obtained on the surface which was coated with 0.5% SDBS and 0.5% fluorocarbon composite reagents. The experiment results indicated that each reagent had a certain optimum adhesive range to the particle. The composite reagents with different proportion of single reagents exhibited some particular physical and chemical properties, which could effectively change the adhesive performance between the solid surface and the particles.

芬顿试剂(Fenton's reagent法降解对苯二酚和工业废水

可溶性亚铁盐和H2O2的组合称为芬顿试剂(Fenton’s reagent),是一种氧化能力很强的氧化剂,常用于废水的净化处理。本文以对苯二酚为代表物,探讨用Fenton试剂氧化的反应条件,并用最佳的实验条件处理工业废水,90分钟工业废水的COD去除率可达71.6％。

Preparation of ZnO Nanoparticles and Photocatalytic H2 Production Activity from Different Sacrificial Reagent Solutions

ZnO nanoparticles were synthesized via a direct precipitation method followed by a hetero- geneous azeotropic distillation and calcination processes, and then characterized by X-ray power diffraction, scanning electron microscopy, transmission electron microscopy, and ni- trogen adsorption-desorption measurement. The effects of Pt-loading amount, calcination temperature, and sacrificial reagents on the present ZnO suspension were investigated, photocatalytic H2 evolution efficiency from the The experimental results indicate that ZnO rianoparticles calcined at 400℃ exhibit the best photoactivity for the H2 production in comparison with the samples calcined at 300 and 500℃, and the photoeatalytie H2 production efficiency from a methanol solution is much higher than that from a triethanolamine solution. It can be ascribed to the oxidization of methanol also contributes to the H2 production during the photochemical reaction process. Moreover, the photocatalytic mechanism for the H2 production from the present ZnO suspension system containing methanol solution is also discussed in detail.

用Lipofectin Reagent转染猪子宫上皮细胞

本文用Lipofectin Reagent作为转染细胞的间型脂质,使Liposome与SV40 ts A209 DNA形成一种混合物转染猪子宫上皮细胞。此法比用磷酸钙和二乙氨乙基葡聚糖转染细胞的方法简单,高效、重复性好。转染后的猪子宫上皮细胞形状和大小略有改变;对温度敏感,用相同培养液培养7天,在33℃条件下细胞的生长速度是在40℃时的5倍.

云南腾冲微细粒铜锌硫化矿选矿试验研究

针对云南腾冲铜锌硫化矿开展试验研究,矿样X荧光光谱分析和多元素化学分析结果表明,矿样中主要的有价元素为Cu、Zn,其他金属元素品位相对较低,矿石含铜0.38%、含锌1.45%,铜主要以硫化铜的形式存在,锌主要以硫化锌的形式存在。矿石矿物组成结果表明,矿样中主要的有用矿物为黄铜矿、闪锌矿,脉石矿物主要为石英,其次为绢(白)云母、透闪石、绿泥石、石榴石、方解石、萤石等。黄铜矿和闪锌矿的嵌布特征分析结果表明,铜锌矿物嵌布粗细不均匀,约有10.90%的铜矿物、29.40%的锌矿物呈微细粒(粒度小于30μm)包裹于脉石矿物中,难以得到高效回收,闪锌矿背散射电子图和能谱分析结果表明,闪锌矿中含S 32.21%、Fe 9.14%、Zn 57.23%,属于铁闪锌矿,不利于锌精矿品位的提高。根据矿样性质,在磨矿细度为-0.074 mm占92%的条件下,采用硫酸锌+亚硫酸钠作锌抑制剂,用量为(2000+1000)g/t,Z-200作铜捕收剂,用量为15 g/t,采用硫酸铜作锌活化剂,用量为100 g/t,新型高效选择性药剂A2作锌捕收剂,用量为60 g/t,通过对锌粗精矿进行再磨再选,确定锌粗精矿的再磨细度为-0.037 mm占90%,采用“一粗一扫两精”选铜、“两粗一扫三精”选锌的全流程闭路试验,获得了铜品位18.93%、回收率76.19%的铜精矿和锌品位40.85%、回收率76.85%的锌精矿。

温州地区HIV假反应性献血者归队策略及结果探讨

目的通过分析人类免疫缺陷病毒(human immunodeficiency virus,HIV)血清学单试剂反应性献血者归队检测结果,探讨现有归队策略设置的合理性及实际效果。方法选取温州地区2023年1月至12月HIV血清学单试剂反应性献血者为研究对象,经温州市疾病预防控制中心(Center for Disease Control and Prevention,CDC)确认检测及归队检测确认是否可以归队,通过献血者基本资料与屏蔽时HIV血清学试验S/CO值分析允许归队率的差异。结果HIV血清学单试剂反应性献血者374人,经CDC确认检测,HIV抗体不确定55人,符合归队条件者319人,主动申请归队84人。78人经归队自检、归队检测均无反应性,允许归队。4人归队自检HIV血清学反应性,1人归队检测HIV核酸检测(nucleic acid testing,NAT)试验反应性,永久屏蔽;1人归队检测抗HIV化学发光免疫测定试验反应性,HIV NAT试验无反应性,继续屏蔽参加下一轮归队。不同年龄、血型及献血次数献血者的允许归队率比较差异均有统计学意义(P<0.05)。屏蔽时不同S/CO值的献血者允许归队率比较差异无统计学意义(χ^(2)=1.898,P=0.168)。结论合理的归队流程可有效减少献血者流失、保障临床用血安全。