Schiff碱型和仲胺型壳聚糖冠醚对金属离子的络合吸附性能

壳聚糖（ＣＴＳ）可有效地去除废水中的有毒金属离子［１］,但其分子中的氨基可接受质子成盐,造成在酸性介质中溶解流失,使应用受到限制．近年来国内外学者对壳聚糖的改性进行了广泛的研究,制备了许多理化特性和用途不同的壳聚糖衍生物［２～８］,扩大了其应用范围,...     

硅胶负载壳聚糖树脂的制备及其对金属离子的吸附性能

将壳聚糖（ＣＴＳ）负载于层析硅胶上，然后于乙二醇中用Ｂ－６３树脂对其进行化学交联，合成了标题化合物（Ｓｉ－ＢＣＴＳ）。研究了ＣＴＳ的浓度、碱的浓度、交联剂的用量及时间等条件对树脂的负载率及时间等因素对金属离子的吸附性能的影响。考察了时间对上述树脂对 Ｃｕ２＋、 Ｎｉ２＋、 Ｚｎ２＋、 Ｃｏ２＋的吸附量的影响。结果表明：１）最佳合成条件是：温度为１２０℃，反应时间为５ｈ，－ＮＨ２与环氧基的比例为１～２： ２～１． ２）上述树脂具有吸附速度快、沉降迅速和对金属离子吸附性能好等特点，其对Ｃｕ２＋、Ｎｉ２＋、Ｚｎ２＋、Ｃｏ２＋的吸附量分别可达到０．４５～０．７５，０．３４～０．６４， ０．０１～０．０２，０．０８～０．２１ｍｍｏｌＭ２＋／ｇ ｒｅｓｉｎ．     

交联壳聚糖在锑形态分析中的应用

研究了交联壳聚糖（ＣＣＴＳ）对Ｓｂ（Ⅲ）－吡咯烷二硫代氨基甲酸铵（ＡＰＤＣ）和Ｓｂ（Ⅴ）－ＡＰＤＣ的吸附行为，并探讨了吸附机理。结果表明：在ｐＨ＝２时Ｓｂ（Ⅲ）－ＡＰＤＣ和Ｓｂ（Ⅴ）－ＡＰＤＣ的吸附率分别为９６％和９８％。吸附后，利用Ｓｂ（Ⅲ）和Ｓｂ（Ⅴ）形成氢化物的不同条件分别测定，建立了氢化物发生原子吸收（ＨＧＡＡＳ）测定水中痕量Ｓｂ（Ⅲ）和Ｓｂ（Ⅴ）的方法。该法的检出限为６０ｎｇ／Ｌ，回收率为９５％～１０７％，相对标准偏差为２１％～５６％。     

硅胶负载壳聚糖树脂的制备及其对金属离子的吸附性能

将壳聚糖（ＣＴＳ）负载于层析硅胶上,然后于乙二醇中用Ｂ－６３树脂对其进行化学交联,合成了标题化合物（Ｓｉ－ＢＣＴＳ）。研究了ＣＴＳ的浓度、碱的浓度、交联剂的用量及时间等条件对树脂的负载率及时间等因素对金属离子的吸附性能的影响。考察了时间对上述树脂对Ｃｕ２＋、Ｎｉ２＋、Ｚｎ２＋、Ｃｏ２＋的吸附量的影响。结果表明：１）最佳合成条件是：温度为１２０℃,反应时间为５ｈ,－ＮＨ２与环氧基的比例为１～２：２～１。２）上述树脂具有吸附速度快、沉降迅速和对金属离子吸附性能好等特点,其对Ｃｕ２＋、Ｎｉ２＋、Ｚｎ２＋、Ｃｏ２＋的吸附量分别可达到０．４５～０．７５,０．３４～０．６４,０．０１～０．０２,．０．０８～０．２１ｍｍｏｌＭ２＋／ｇｒｅｓｉｎ．     

氮杂冠醚接枝壳聚糖的合成及其对金属离子的吸附性能

本文利用壳聚糖Ｃ２位上活泼的氨基先与苯醛反应制备成保护氨基的Ｓｃｈｉｆｆ碱壳聚糖,再将含环氧基的氮杂冠醚接枝到壳聚糖的Ｃ６位上,制得含Ｓｃｈｉｆｆ碱的氮杂冠醚壳聚糖,随后使其在一定条件下脱去苯甲醛,合成了一种含氮杂冠醚功能基的新型壳聚糖衍生物,研究了其重金属离子Ｐｂ＾２＋,Ｃｕ＾２＋、Ｃｒ＾３＋、Ｃｄ＾２＋的静态吸附性能。结果表明,该吸附剂对重金属离子具有较强的吸附能力,在Ｐｈ＾２＋、Ｃｕ＾２＋、     

壳聚糖季铵化衍生物的吸湿性与保湿性

壳聚糖季铵化衍生物的吸湿性与保湿性许晨，卢灿辉（福建师范大学高分子研究所福州３５０００７）关键词壳聚糖季铵盐，壳聚糖衍生物，吸湿性，保湿性壳聚糖是从虾、蟹等废弃甲壳中提取得到的一种生物活性物质［１，２］，由于其特有的直链聚阳离子结构，成膜附于角蛋白与...     

壳聚糖吸附剂的制备及其性能

本文以壳聚糖为主要原料，分别经过悬浮交联和复合制备得到壳聚糖（Ｃｈｉｔｏｓａｎ）树脂吸附剂（简称ＣＳ吸附剂）和壳聚糖—活性炭（Ｃｈｉｔｏｓａｎ－Ａｃｔｉｖｅｃａｒｂｏｎ）复合吸附剂（简称ＣＳ—ＡＣ吸附剂）。研究影响制备吸附剂的诸因素；测定两种吸附剂的性能；探讨两种吸附剂对印染废水的脱色和对有毒金属离子的去除。研究结果表明：本研究条件下制得的ＣＳ和ＣＳ—ＡＣ吸附剂比表面积分别为８２．９Ｍ２／ｇ和９３７．３Ｍ２／ｇ；对亚甲基蓝溶液（５００ｍｇ／Ｌ）的静态吸附量为１４１．２ｍｇ／ｇ吸附剂和８３５．１ｍｇ／ｇ吸附剂；ＣＳ吸附剂对印染废水的动态脱色量为１２６．９ｍｇ／ｇ吸附剂；两种吸附剂对有毒重金属Ｐｂ（２＋）的去除率均达９０％以上，而且耐酸、碱性能较好，均为优良的颗粒状吸附剂。     

反应性高分子科技文摘

反应性高分子科技文摘由环氧聚氯丁橡胶制备离子交换剂Ｄｕｒｇａｒｙａｎ，Ａ．Ａ．；ｅｔａｌ，ＳＵ１，６８０，７２２（１９９１）在Ｃ６Ｈ６－ＤＭＦ混合物中，通过环氧聚氯丁橡胶（环氧度９０ｍｏｌ％）和Ｎａ２Ｓ反应，制得了一种提高了对Ｈｇ３＋的吸附容量的离子...     

单克隆抗体免疫吸附剂的制备及对乙型肝炎表面抗原的吸附

通过环氧氯丙烷活化（１，４） ２ 氨基 ２ 脱氧 β Ｄ 葡萄糖（壳聚糖）制备免疫吸附剂，详细讨论了环氧氯丙烷活化过程的影响因素，确定了活化的最佳条件．活化（１，４） ２ 氨基 ２ 脱氧β Ｄ 葡萄糖树脂对单克隆抗体的偶联率为１７６％，对含乙型肝炎表面抗原阳性血清的吸附实验表明，制备的免疫吸附剂能使阳性转为阴性，吸附率为４４％．     

壳聚糖基抗菌材料的制备研究新进展

壳聚糖及其衍生物的抗菌活性和优良加工性能,使其成为巨大潜力的抗菌材料,可用于食品保鲜、伤口敷料、纺织品功能化和组织工程等方面。本文综述了近年来壳聚糖基抗菌材料的制备研究新进展,并讨论了壳聚糖基材料的抗菌模型及影响抗菌活性的因素,希望对壳聚糖基抗菌材料的制备及抗菌活性的优化提供指导。     

二氧化碳和丙烯直接合成甲基丙烯酸的NiPMo/TiO2催化剂的研究

用溶胶-凝胶法以磷钼酸(MPA)的镍盐溶液水解钛酸四丁酯制备了NiPMo/TiO2催化剂.使用ICP、 XRD、 TG-DTA、 IR、 TPD-MS和微反应技术研究了催化剂的化学组成、热稳定性、化学吸附性质和催化反应性能.杂多钼酸盐与TiO2通过O2-在TiO2表面发生了键合.在623 K下,杂多阴离子仍保持原有的Keggin结构.CO2在Lewis酸位Ni(Ⅱ)和Lewis碱位Ni-O-Mo的桥氧协同作用下生成CO2卧式吸附态Ni(Ⅱ)←O-(CO)←(O--Ni).丙烯有多种吸附态在催化剂上吸附.在563 K、 1 MPa和空速1500 h-1的反应条件下,丙烯的摩尔转化率为3.2%,产物MAA选择性为95%.     

Toward new camptothecins. Part 6: Synthesis of crucial ketones and their use in Friedländer reaction

In the context of the preparation of camptothecin and luotonin A analogs, the synthesis of some key keto-precursors and their use in Friedländer condensation are described. This paper also focuses on the stability of these keto intermediates and emphasizes the major differences between indolizinones and pyrroloquinazolinones series. Noteworthy is also the report of some original structures isolated as by-products of some experiments.     

α-Amino acid derived enaminones and their application in the synthesis of N-protected methyl 5-substituted-4-hydroxypyrrole-3-carboxylates and other heterocycles

A new and simple synthesis of novel N-protected methyl 5-substituted-4-hydroxypyrrole-3-carboxylates, which exist in equilibrium with their 4-oxo tautomers, has been developed in two steps starting from N-protected α-amino acids. The key intermediates are enaminones, which can also be isolated, characterized, and used for the construction of other functionalized heterocycles, before they spontaneously decompose to pyrrole products. 4-Hydroxypyrroles are prone to partial aerial oxidation but can be efficiently alkylated or reduced to stable polysubstituted pyrrolidine derivatives.     

Specific intramolecular aromatic CH insertion of diazosulfonamides

The chemoselectivity in the intramolecular CH insertion of various diazosulfonamides has been experimentally studied. The results reveal that the aliphatic 1,4-, 1,5-, or 1,6-C(sp³)?H insertions of diazosulfonamides are not accessible, while the aromatic 1,5-C(sp²)?H insertion can be realized specifically by adjusting the diazo-adjacent group. In addition, the general chemoselectivities in the intramolecular CH insertions of diazosulfonyl compounds are summarized. Generally, diazosulfones undergo both aromatic 1,5-C(sp²)?H and aliphatic 1,5- and 1,6-C(sp³)?H insertions, while diazosulfonates undergo aliphatic 1,5- and 1,6-C(sp³)?H insertions. However, diazosulfonamides only undergo aromatic 1,5-C(sp²)?H insertion.     

CoFe2O4自形成磁性液体场致结构化对磁化的影响

The Langevin paramagnetic theory can’t describe the relation between magnetization of ferrofluids and applied magnetic field. The structuralization of ferrofluids, which is considered the main influence factor of the magnetization, is regarded. The part of magnetization works is deposited when the structure is forming. This action influences the magnetization of ferrofluids directly or indirectly. On the base of the “compressing” model, the Langevin function that usually describes the magnetization of ferrofluid is modified, and a well-fitted curve is obtained. An equation of the relation between the equivalent volume fraction after being “compressed” and the intensity of magnetic field is discovered, which approximately describes the process of magnetization. The relation between the approximate initial susceptibility and the volume fraction can be obtained from modified formula.     

KMnO4-mediated oxidative CN bond cleavage of tertiary amines: Synthesis of amides and sulfonamides

KMnO₄-mediated oxidative CN bond cleavage of tertiary amines producing secondary amine was introduced, which was trapped by electrophiles (acyl chloride and sulfonyl chloride) to form amides and sulfonamides. The reaction could take place at mild condition, tolerating a wide range of function groups and affording products in moderate to excellent yields.     

Highly regioselective Buchwald–Hartwig amination at C-2 of 2,4-dichloropyridine enabling a novel approach to 2,4-bisanilinopyridine (BAPyd) libraries

The highly regioselective Buchwald–Hartwig amination at C-2 of the cheap and readily accessible reagent, 2,4-dichloropyridine with a range of anilines and heterocyclic amines is described. This new methodology is robust and provides a facile access to 4-chloro-N-phenylpyridin-2-amines on 0.25 mol scale. These intermediates undergo a further Buchwald–Hartwig amination at higher temperature to enable rapid exploration of the chemical space at C-4 and to provide a library of 2,4-bisaminopyridines.     

Chemistry of heterocyclic compounds at the A. E. Favorsky Irkutsk Institute of Chemistry, Siberian Branch of the Russian Academy of Sciences, over 50 years (Review)

The review contains a concise historical account and information on the most significant researches undertaken by the staff at the A. E. Favorsky Irkutsk Institute of Chemistry, Siberian Branch of the Russian Academy of Sciences on the Chemistry of Heterocyclic Compounds. Dedicated to Academician of the Russian Academy of Sciences B. A. Trofimov on his 70th jubilee. Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 10, pp. 1443–1502, October, 2008.     

N-Heterocyclic carbene-palladacyclic complexes: synthesis,characterization and their applications in the C-N coupling and α-arylation of ketones using aryl chlorides

N-Heterocyclic carbene-palladacyclic complexes 3 were successfully achieved in a one-pot procedure under mild conditions. The structure of 3a was unambiguously confirmed by X-ray single crystal diffraction and it was an active catalyst in the Buchwald-Hartwig amination and α-arylation of ketones even at very low catalyst loadings (0.01?mol%).     

Iodine-mediated oxidative Pictet-Spengler reaction using terminal alkyne as the 2-oxoaldehyde surrogate for the synthesis of 1-aroyl-β-carbolines and fused-nitrogen heterocycles

An efficient iodine-mediated oxidative Pictet-Spengler reaction in dimethyl sulphoxide (DMSO) using terminal alkynes as the 2-oxoaldehyde surrogate for the synthesis of aryl (9H-pyrido[3,4-b]indol-1-yl)methanones is described. The scope of the protocol includes the total synthesis of Fascaplysin, Eudistomins Y₁ and Y₂. The methodology is extended for preparing pyrrolo[1,2-a]-quinoxaline and indolo[1,5-a]quinoxaline derivatives. The utility of 1-aroyl-β-carbolines was demonstrated by performing palladium-catalyzed β-carboline directed ortho-C(sp2)-H functionalization of the phenyl ring with thiomethyl (SMe) group using DMSO as source and for accessing 4-aryl-canthin-6-ones.