相转移催化条件下N-芳酰基-N＇-芳基硒脲衍生物的合成及其晶体结构

硒是人体所必需的14种微量元素之一，硒脲作为有机硒化合物中的重要一类，在抗菌和抗肿瘤方面已显示出了很高的生物活性．关于芳酰基硒脲的合成方法虽然早在1937年就有报道，但是由于反应复杂且控制条件苛刻，故有关芳酰基硒脲的研究至今仍然很少见报道．     

相转移催化条件下N-芳酰基-N''''-芳基硒脲衍生物的合成及其晶体结构

硒是人体所必需的14种微量元素之一, 硒脲作为有机硒化合物中的重要一类, 在抗菌和抗肿瘤方面已显示出了很高的生物活性[1]. 关于芳酰基硒脲的合成方法虽然早在1937年就有报道[2], 但是由于反应复杂且控制条件苛刻, 故有关芳酰基硒脲的研究至今仍然很少见报道.     

相转移催化条件下N-芳酰基-N′-芳基硒脲衍生物的合成及其晶体结构

硒是人体所必需的14种微量元素之一,硒脲作为有机硒化合物中的重要一类,在抗菌和抗肿瘤方面已显示出了很高的生物活性[1].关于芳酰基硒脲的合成方法虽然早在1937年就有报道[2],但是由于反应复杂且控制条件苛刻,故有关芳酰基硒脲的研究至今仍然很少见报道.我们曾用相转移催化法合成了芳酰基硫脲衍生物[3],鉴于硒、硫有机化合物的相似性,本文将相转移催化法应用到芳酰基硒脲的合成中,在温和条件下,方便、快速、较高产率地合成了一系列N-芳酰基-N′-芳基硒脲(2a~2l).作为超分子化学方面研究的一部分[4,5],合成了化合物2a的单晶,并对其晶体结构…     

双酰基脲化合物的合成研究

研究了双酰基脲化合物的制备方法-芳酰基异氰酸酯与呋喃甲酰胺之间的亲核加成反应，制得5个未见报道的N-取代苯甲酰基-N'-5-取代苯基-2-呋喃甲酰基脲，结构均经^1H NMR、IR、元素分析确证。     

硒脲及其衍生物的合成和应用

硒脲及其衍生物具有抗真菌、抗肿瘤、抗癌等生物活性,可作为合成其它化合物的中间体和配体,还可用于增强显影剂的感光度。硒脲及取代硒脲的合成有取代脲法、氨腈法、异硒氰酸酯法等,缩氨基硒脲的合成有硒氰酸盐法和取代硫脲法,酰基硒脲的合成用常规法和相转移催化法。本文对硒脲及其衍生物的上述合成方法和应用作了介绍。     

1,3,4-噻二唑基芳酰基脲的合成和生物活性

以2-氨基-5-取代苯基-1,3,4噻二唑和2,6-二氟苯甲酰异氰酸酯为起始原料,合成了10个未见文献报道的含1,3,4-噻二唑环的芳酰基脲类衍生物。通过1H NMR,IR,ESI-MS和元素分析确定化合物的结构。初步生物活性测试表明,此类化合物具有一定的杀虫活性,其中化合物3d (3,5-(CH3)2)和3g (4-C4H9)对蚕豆蚜的杀虫死亡率达到90%以上.     

芳脲基酰基硫脲衍生物的固相研磨合成及其植物生长活性

在无溶剂条件下,室温研磨合成了11个未见报道的芳脲基酰基硫脲类化合物,经核磁共振氢谱、红外光谱和元素分析确定结构,并进行了初步的生物活性试验,结果表明,浓度采用10 mg/L时,一些目标化合物具有较好的植物生长调节活性,其中N-苯脲基-N′-肉桂酰基硫脲和N-对甲苯脲基-N′-肉桂酰基硫脲具有较好的生长素活性,分别为54.13%和46.79%;N-对甲苯脲基-N′-肉桂酰基硫脲和N-对甲苯脲基-N′-苯氧乙酰基硫脲具有较好的细胞分裂素活性,分别为55.11%和51.14%。     

N-(1, 3, 4-噻二唑-2-基)-N′-芳酰基脲的合成及其生物活性

2-氨基噻二唑与芳酰基异氰酸酯反应合成了13种N-(1,3,4-噻二唑-2基)-N'-的芳酰基脲,产率为54.5%～86.2%. 用核磁共振氢谱、红外光谱和元素分析确证了目标化合物的结构,室内的生物活性测定试验表明,目标化合物中的2b、2c、2e和2h具有优良的植物生长调节活性.     

N1-吡啶甲基-N-芳酰基脲衍生物的合成及生物活性

吡啶衍生物;N1-吡啶甲基-N-芳酰基脲衍生物的合成及生物活性     

N-(1, 3, 4-噻二唑-2-基)-N′-芳酰基脲的合成及其生物活性

N-(1;3;4-噻二唑-2-基)-N′-芳酰基脲的合成及其生物活性;噻二唑;芳酰基脲;合成;生物活性;植物生长调节剂     

ULTRAMINE: a high-capacity polyethylene-imine-based polymer and its application as a scavenger resin

The synthesis of a novel high-loading polyethylene-imine resin (ULTRAMINE) is described, and its application as a scavenger resin in various acylation reactions is demonstrated. The inverse suspension polymerization technique was used for the synthesis of well-defined spherical polymer beads. Polymer beads with different cross-linking densities were synthesized according to the degree of acryloylation of the polyethylene-imine polymer. The resin was characterized by various spectroscopic techniques. The size, shape, and morphological features of the resin were demonstrated by microscopy. The resin showed excellent swelling properties in both polar and nonpolar solvents. The chemical stability of the resin in various reagents and solvents was investigated and monitored by IR spectroscopy. The mechanical stability of the beads was determined by a single-bead compressive experiment. The ULTRAMINE beads can be used as an excellent scavenger for excess acylating reagent, as demonstrated for a variety of reactions. ULTRAMINE-red resin was derived from ULTRAMINE through exhaustive reduction of the amide carbonyl groups to yield an all-amine resin.     

超声活化的CuBr~2 / Al~2O~3 对萘的溴化

本文用超声及非超声的方法制备了以氧化铝为载体的溴化铜, 并研究了它们对萘的溴化反应.     

KF-Al2O3催化合成2-甲基-1-苄基苯并咪唑

苯并咪唑类杂环化合物具有杀菌、消炎、抗癌、抗氧化的活性,广泛用于食品的防虫和防腐,用于动、植物病毒的防治,人体疾病和肿瘤的防治[1-3],本文用KF Al2O3作催化剂,用DMF为溶剂,利用2 甲基苯并咪唑与苄基溴反应合成2 甲基 1 苄基苯并咪唑的新型方法,考察了诸因素对产率的影响,找出了最佳的反应条件。合成路线如下:1　实验部分1 1　仪器与试剂Brurer AM 500超导核磁共振波谱仪(溶剂CDCl3);CarloErbal1106型元素分析仪,NicoletIm pact410型红外光谱仪,KBr压片,HP1100型和Finnigan FTMS 2000型质谱仪(以上均由华东理工大学分析…     

KF-Al~2O~3试剂在有机合成反应中的应用进展

综述了自1979年Yamawaki和Ando发现KF-Al~2O~3试剂的催化特性以来在有机合成反应中的应用研究进展。     

纳米Bi~2O~3微粒的固相合成及其电化学性能的研究

用室温和低温固相反应法,采用两种反应途径合成了纳米Bi~2O~3微粒,并用XRD,TEM,CV及恒流充放实验对其性能进行了研究。     

Amino-functionalized carbon nanotubes as nucleophilic scavengers in solution phase combinatorial synthesis

A versatile method for fast scavenging a variety of electrophiles using carbon nanotubes functionalized by amino groups (CNT-NH₂) is reported. Following the scavenging event, CNT-NH₂ can be easily separated from the reaction mixture by filtration, leaving the desired products in excellent yields and purities.     

Selective synthesis of 2-aminobenzoxazoles and 2-mercaptobenzoxazoles by using o-aminophenols as starting material

2-Aminobenzoxazoles and 2-mercaptobenzoxazoles were selectively synthesized by treating o-aminophenols with dithiocarbamates and tetramethylthiuram disulfide (TMTD), respectively. With the promotion of NaH/CuI, the reaction of o-aminophenols with dithiocarbamates gave 2-aminobenzoxazoles with good yield (70–92%) in one pot manner, and 2-mercaptobenzoxazoles were synthesized (yield: 55–80%) in the presence of K₂CO₃ by treating o-aminophenols with tetramethylthiuram disulfide (TMTD). The feature of this method includes good to excellent yield, easy performance and broad substrate scope, which makes the protocol practical and attractive in the preparation of some potential pharmaceutically active compounds.     

The effect of a radical scavenger on the propagation of flames in an exothermic-endothermic system

The propagation of a premixed laminar flame supported by an exothermic chemical reaction under adiabatic conditions but subject to inhibition through parallel endothermic chemical processes is considered. These consist of the endothermic decomposition of an inhibitor W leading to the formation of a ‘radical scavenger’ S, which acts as a catalyst for the removal of active radicals X through an additional termination step. The heat loss through the endothermic reaction and the action of the radical scavenger, represented by the parameters α and ρ, both have a strong quenching effect on wave propagation. The dependence of the flame velocity c on α and ρ is determined by numerical integration of the flame equations for a range of values of the other parameters. The (ρ ,c) curve can have at least one turning point, the (α,c) curve can be monotone or it can have one or three turning points, depending on the values of the parameters β, representing the rate at which inhibitor is consumed, μ, the ratio of the activation energies of the reactants and the Lewis numbers. The additional feature caused by the scavenger is that the (α, c) curve has a turning point for any (μ, β) parameter pair if ρ is sufficiently large. A new feature of the model is that, for non-zero values of ρ, there can be four solutions below critical values of α. This behaviour is confirmed by a high activation energy analysis, which also reveals some additional features of the flame structure resulting from the presence of the radical scavenger.AMS subject classification: 80A25, 35K57, 35B32     

Nitromethane as a scavenger of acrylonitrile in the deprotection of synthetic oligonucleotides

A novel deprotection procedure for synthetic oligonucleotides was developed to prevent nucleobase alkylation. Acrylonitrile, a side product of the deprotection of a 2-cyanoethyl phosphate protecting group and which causes nucleobase alkylation, was found to be trapped by the addition of some acidic compounds, which generate a carbanion species under the conventional deprotection conditions using aqueous NH₃. The 2-cyanoethylation of thymidine was inhibited effectively in the presence of nitromethane.     

焙烧温度对Cu/ZrO2和Cu-La2O3/ZrO2催化性能的影响

Cu／ZrO2催化剂作为一种新型的甲醇合成催化剂,和Cu-Zn-Al催化剂相比,具有优良的催化活性[1,2]．Cu／ZrO2催化剂中活性中心及合成甲醇的反应机理与Cu-Zn-Al催化剂有较大差别,铜锆分散度及界面大小对甲醇合成活性有重要影响,如Keoppel等人研究发现,当Cu／ZrO2催化剂焙烧温度达到923K,ZrO2发生晶化,严重影响铜锆界面从而显著降低催化剂的活性[3]．ZrO2作为p型半导体,在催化剂中不仅起对催化剂活性组分进行支撑和分散作用,它可与催化剂活性组分产生独特的相互作用．近年来,铜锆之间的相互作用及协同效应日益受到人们重视[4…