大孔弱碱性阴离子树脂吸附分离β-萘磺酸

β-萘磺酸;弱碱性树脂;大孔弱碱性阴离子树脂吸附分离β-萘磺酸     

弱碱性大孔吸附树脂对腐殖酸的吸附

研究了腐殖酸分子量对弱碱性大孔树脂吸附腐殖酸的影响, 阐明了溶液中小分子芳环化合物(苯酚)及盐含量对树脂吸附腐殖酸的影响机制. 结果表明, 树脂对低分子量腐殖酸的吸附效果要优于高分子量腐殖酸; 低浓度苯酚在溶液中可以促进树脂吸附腐殖酸, 但溶液中苯酚浓度过高会对树脂吸附腐殖酸产生抑制作用; 溶液中的盐对树脂吸附腐殖酸的影响取决于溶液的pH值.     

大孔吸附树脂的吸附机理

大孔吸附树脂(macroprous adsorption resin, MAR)是近几十年发展起来的一种具有多孔立体结构、人工合成的有机高分子聚合物。由于其特殊的理化性质和吸附性能,已被广泛应用于化学、医药、环保和食品等领域。本文介绍了近年来国内外对大孔吸附树脂在吸附机理研究方面的进展,重点介绍了不同温度条件下大孔吸附树脂对靶标分子的吸附热力学行为模式,靶标分子在大孔吸附树脂表面及孔内的吸附扩散行为模式。此外,大孔吸附树脂性能参数和靶标分子结构参数之间构效关系也对其吸附选择性规律具有重要的影响。因此,大孔吸附树脂与底物间构效关系的匹配程度及其对选择性的影响是大孔吸附树脂分离理论研究的核心。本文最后介绍了可以准确客观描述吸附过程并具有一定使用范围的大孔吸附树脂吸附模型的建立和评价。     

大孔吸附树脂对洋地黄强心甙吸附性能的研究.I.

本文从六种大孔吸附树脂中筛选出ＨＡ－２和ＨＡ－３二种树脂，这二种树脂对洋地黄类强心甙－－地高辛具有较好的吸附性能，测定了吸附树脂的比表面积、孔容及平均孔径，讨论了地高辛溶液的浓度、ｐＨ值等诸条件对大孔吸附树脂吸附性能的影响。     

大孔吸附树脂对肿瘤坏死因子吸附性能的研究

选用NK-110、碳化树脂和MET-10043种大孔吸附树脂,通过对树脂吸附量的测定,吸附动力学曲线和吸附等温线的描述等方法,研究了3种大孔吸附树脂对血浆中TNFα的吸附性能,结果表明NK-110和MET-1004对TNFα的吸附量较高,其中又以MET-1004的吸附速率最快     

吸附树脂对山梨酸的吸附作用及其热力学性质

大孔吸附树脂;吸附树脂对山梨酸的吸附作用及其热力学性质     

大孔磷酸树脂吸收镧的研究

本文测定了大孔膦酸树脂对Ｌａ＾３＋的吸附容量，介质ｐＨ、温度、吸附时间等因素对吸附的影响，测得吸附速率常数Ｋ２９８＝７．６４×１０＾－５Ｓ＾－１，树脂功能基与Ｌａ＾３＋的络合比为３：１，用化学及红外光谱等方法，得到大孔膦酸树脂吸附Ｌａ＾３＋的基本参数及其机理。     

用大孔吸附树脂分离利血平

以利血平的吸附量和解吸率为指标,筛选大孔吸附树脂.研究吸附和解吸的优化条件,并考察选定树脂的吸附等温线、吸附动力学、吸附和解吸性能.结果表明,将催吐萝芙木根粉浸提液蒸去乙醇且不调pH(pH 1)进行吸附,HZ-818型大孔吸附树脂对利血平的吸附量可达到9.34mg/mL.使用工业乙醇-水(80:20,pH 1.0)为解吸剂,解吸率可达99.3%.该树脂的吸附符合Langmuir吸附等温方程.吸附前期,吸附速度较快,以后速度减慢.HZ-818型树脂对利血平的吸附量大,解吸率高,通过大孔树脂吸附和解吸,利血平浓度提高50倍以上,适宜于工业化生产.     

大孔树脂吸附苯肼的静态相平衡研究

比较3种了大孔吸附树脂对废水中苯肼的吸附能力，证明Hz-841大孔树脂的吸附效果最佳．根据实验建立了Hz-841大孔树脂静态吸附容量与温度、苯肼浓度、以及离子强度间的相平衡关系．     

大孔树脂吸附裸花紫珠苯乙醇苷的动力学与热力学研究

考察不同类型大孔树脂吸附裸花紫珠苯乙醇苷的动力学与热力学特性,为该类化合物的分离纯化提供参考。以吸附率、解吸率为综合评价指标,通过静态吸附-解吸附试验从6种大孔树脂中筛选出最适合纯化裸花紫珠苯乙醇苷类成分的大孔树脂类型,建立大孔树脂纯化裸花紫珠苯乙醇苷的吸附动力学模型和等温吸附模型,探究其吸附过程。根据初步筛选结果,选择SP-827、SP-207和X-5型大孔树脂进一步考察,3种树脂具有大致一样的吸附过程：0～60 min为快速吸附阶段;60～360 min为缓慢吸附阶段;360～1080 min为吸附平衡阶段。准二级动力学方程能很好地模拟3种型号的大孔树脂对裸花紫珠苯乙醇苷的吸附动力学过程,吸附速率受液膜扩散和颗粒内扩散共同影响;Langmuir模型和Freundlich模型都能较好地拟合吸附等温线数据,3种类型的大孔树脂对裸花紫珠苯乙醇苷都具有良好的吸附性能,吸附过程属于“优惠吸附”。动力学模型与热力学模型都能很好地拟合这3种类型大孔树脂纯化裸花紫珠苯乙醇苷的吸附过程,其中国产树脂X-5可以用来代替进口树脂SP-825或SP-207用于裸花紫珠苯乙醇苷类成分的分离和纯化研究,也是纯...     

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%.     

Synthesis of 1-benzyloxypyrazin-2(1H)-one derivatives

Different approaches for the synthesis of 1-benzyloxypyrazin-2(1H)-one derivatives from simple amino acids have been investigated. A library of 33 precursors for the preparation of N-hydroxy pyrazinones was obtained in moderate to good yields.     

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.     

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.     

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.     

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.     

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.     

A general and convenient synthesis of 4-(tosylmethyl)semicarbazones and their use in amidoalkylation of hydrogen,heteroatom, and carbon nucleophiles

A general synthesis of previously unknown semicarbazone-based α-amidoalkylating reagents, 4-(tosylmethyl)semicarbazones, has been developed. The synthesis involved three-component condensation of semicarbazones of aliphatic or aromatic aldehydes with the same or other aldehydes and p-toluenesulfinic acid. The scope and limitations of this reaction were investigated. The compounds obtained were demonstrated to be an efficient α-(4-semicarbazono)alkylating agents. They were reacted with H- (sodium borohydride), O- (sodium methylate), S- (sodium phenylthiolate), N- (pyrrolidine, sodium succinimide), P- (trialkyl phosphites), and C-nucleophiles (sodium diethyl malonate) to give the corresponding products of the tosyl group substitution, 4-substituted semicarbazones, including analogues of nitrofurazone. Among the prepared compounds tested in vitro for antibacterial and antifungal activity, three nitrofuryl-containing semicarbazones exhibited high biological activities with minimum inhibitory concentration (MIC) values of 8–32 μg/mL.     

Sulfur-directed metal-free and regiospecific methyl C(sp3)–H imidation of thioanisoles

Regiospecific and direct imidation of the methyl C(sp³)–H bond of thioanisoles is realized under mild and metal-free conditions with N-fluorobis(benzenesulfonyl)imide as an oxidant and nitrogen source. Proposed mechanism suggests that thionium ion intermediates and a Pummerer-type reaction are involved. The imidation has advantages such as high step-economy, excellent functionality tolerance, and regiospecificity, giving structurally diverse imidation products.     

Synthesis of novel chiral bidentate hydroxyalkyl-N-heterocyclic carbene ligands and their application in palladium-catalyzed Mizoroki–Heck couplings and asymmetric addition of diethylzinc to benzaldehyde

A small library of new chiral bidentate hydroxyalkyl-imidazolium salts 1 is conveniently synthesized on multi-gram scale from inexpensive and commercially available chiral pool amino acids. The corresponding carbenes, generated by deprotonation of imidazolium salts 1, in combination with palladium(II) chloride were tested in the Mizoroki–Heck coupling reaction. The most significant results in terms of yields and reactivities were achieved with low catalyst loading. The catalytic activities of these imidazolium salts were also investigated in the asymmetric addition of diethylzinc to benzaldehyde. The use of MgO nanoparticles as an additive in conjunction with these ligands played a crucial role in increasing the efficiency of these reactions.