烷基醇聚氧乙烯醚中二噁烷的测定

 采用顶空气相色谱法测定了烷基醇聚氧乙烯醚中的二口恶烷。研究了顶空条件，标准曲线的相关系数为０．９９８９，检出限为２０μｇ／Ｌ，回收率为９１．６％～９７．６％，相对标准偏差小于２．５％。     

顶空气相色谱法测定延生护宝液中甲醇残留量

本文用顶空气相色谱法，以ＧＤＸ－１０１为固定相，测定了延生护宝液中甲醇残留量，方法的回收率在８５．９％－１０１．６％之间，变异系数０．３％，最小检出量１．０ｍｇ／Ｌ。     

用大口径毛细管气相色谱法快速测定塑料食品包装袋中有机残留物

采用５３０μｍ大口径毛细管色谱柱,顶空气相色谱－火焰电离检测器测定,建立了一种塑料食品包装袋中有机溶剂———甲苯、乙酸乙酯、丁酮和异丙醇残留的气相色谱快速分析方法,回收率为９４．８％～１０１．６％,相对标准偏差为０．８％～２．７％。方法简便、灵敏、准确、重现性好。     

HPLC法快速测定峰皇浆及制品中添加的维生素B6

本文研究了快速、简便测定蜂皇浆及制品中添加的低含量维生素Ｂ_６的ＨＰＬＣ法。称取适量样品，用１０％偏磷酸提取、净化，清液供ＨＰＬＣ分析用。ＷＡＴＥＲＳ荧光检测器，激发波长２９０ｎｍ，发射波长３９０ｎｍ，ＶＢ_６含量在０～１２０ｎｇ之间工作曲线相关系数大于０．９９９，样品中ＶＢ_６含量为０．１％～５％时，方法回收率为９２．１７％～９８．４２％，相对标准偏差（ｎ＝６）小于３．７％。     

线性迭代法同时测定小儿退热灵片中乙酰水杨酸和苯巴比妥的含量

本文利用线性迭代法同时测定了小儿退热灵片中乙酰水扬酸和苯巴比妥的含量。乙酰水杨酸的回收率为９９．６％（ＲＳＤ＝０．５８％，ｎ＝６），苯巴比妥的回收率为１００．４％（ＲＳＤ＝１．６６％，ｎ＝６）。本法测定结果与黑龙江省药品标准方法测定结果基本一致，本法简单，快速，适合该剂剂中两组份的同时测定。     

顶空气相色谱法测定头孢氨苄中有机残留溶剂甲醇

采用顶空气相色谱法测定了头孢氨苄中有机残留溶剂甲醇的含量；以0．5mol/L氢氧化钠溶液为溶剂制备供试品溶液，以ChrompackCP-Si 8CB弹性石英毛细管柱为分离柱，研究了盐析效应、顶空加热温度和顶空热平衡时间对甲醇测定的影响；当添加水平为96．0μg时，回收率为98％～104％，测定相对标准偏差RSD为1．2％(n=6)，检出限为0．5mg／L(信噪比为3：1)，甲醇质量浓度为9．6～153．6mg／L时，线性相关系数为0．9999。     

火焰原子吸收法测定胃乃安胶囊中铜铅含量

采用干灰化法处理样品，火焰原子吸收光谱法测定胃乃安胶囊中铜、铅含量，用氚灯背景校正，有效地消除了基体干扰，方法的检出限为Ｃｕ：０．０２３ｍｇ／Ｌ，ｐｂ：０．０７０ｍｇ／Ｌ，ＲＳＤ在２．９％～５．６％之间，回收率分别为Ｃｕ：９３％～１０３．６％；ｐｂ：８８．２％～９５．０％。     

环氧化植物油的制备

天然油脂在无溶剂加压（约０．１５ＭＰａ）条件下，经甲酸（８５％）、双氧水（５０％）环氧化，一步合成增塑剂兼稳定剂环氧化油脂，得微黄色油状透明液体；环氧大豆油和环氧葵子油的环氧值均在６．２％～６．６％，环氧玉米油的环氧值６．０％～６．４％；碘值小于３ｍｇ／ｇ；精油转化率１０４％～１０８％。     

多波长线性回归－导数分光光度法测定对苯二酚、邻苯二酚和苯酚

本文将导数分光光度法与多波长线性回归法联用，测定了电有机合成产品中的对苯二酚、邻苯二酚和苯酚的含量。回收率在９５．０％～１００．１％之间。模拟合成样品分析结果的相对误差为０．１％～６．６％。方法简便。     

注射用舒尔哌酮的高效液相色谱分析

建立了高效液相色谱法分离与测定复方制剂舒尔哌酮中斯巴坦及头孢哌酮的含量。采用Ｃ_（１８），１０μｍ，４．６ｍｍ×２５０ｍｍ（大连化物所Ｓｐｈｅｒｉｓｏｒｂ）柱，以０．２５％三乙胺溶液（用磷酸调ｐＨ６．０）＋乙腈（８６．５＋１３．５）为流动相，在紫外检测器２１０ｎｍ波长处进行检测，线性范围０．０５～０．６ｍｇ／ｍＬ，γ＝０．９９９９（ｎ＝５），精密度：斯巴坦及头孢哌酮的日内平均ＲＳＤ分别为０．６％及０．７５％（ｎ＝１８），日间平均ＲＳＤ分别为０．８６％及０．８７％（ｎ＝１２）。     

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%.     

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.     

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.     

Selective syntheses of 2H-1,3-oxazines and 1H-pyrrol-3(2H)-ones via temperature-dependent Rh(II)-carbenoid-mediated 2H-azirine-ring expansion

The Rh(II)-catalyzed reaction of 2-carbonyl-substituted 2H-azirines with ethyl 2-cyano-2-diazoacetate or 2-diazo-3,3,3-trifluoropropionate provides an easy access to 2H-1,3-oxazines and 1H-pyrrol-3(2H)-ones. These compounds can be selectively prepared from the same starting material using temperature as the only varied parameter. The 2-azabuta-1,3-diene intermediate, a common precursor for both heterocyclic products, isomerizes into 2H-1,3-oxazine under kinetic control, while 1H-pyrrol-3(2H)-one is the sole product of the reaction at elevated temperatures. According to DFT-calculations a one-atom oxazine ring contraction involving ring-opening to a 2-azabuta-1,3-diene intermediate, followed by a 1,5- and 1,2-prototropic shift leads to the consecutive formation of imidoylketene and azomethine ylide, which then further undergo cyclization to the pyrrole derivative.     

Copper catalyzed/mediated synthetic methodology for ebselen and related isoselenazolones

Scope of the copper catalyzed/mediated selenium-nitrogen coupling reaction has been studied for the synthesis of isoselenazolones. It is noticed that the 2-chloro, 2-bromo-, and 2-iodo-aryl amides substrates can be exploited in the selenium-nitrogen coupling reaction by employing 25-100 mol % of CuI/1,10-phenanthroline (L) and potassium carbonate as a base in DMF. Furthermore, electron rich 2-chloro-arylamides also underwent selenium-nitrogen coupling reaction to give biologically important selenium-nitrogen heterocycles. Also, copper-catalyzed selenium-nitrogen coupling reaction has been meticulously applied for the synthesis of diaryl diselenides having methoxy, amine, and amide functionality from respective aryl iodides in the presence of stoichiometric amount of succinimide as an external Se-N coupling partner.     

Knoevenagel condensation catalyzed by novel Nmm-based ionic liquids in water

A series of novel N-methyl morpholine (Nmm) based ionic liquids with 1,2-propanediol group were synthesized and used as catalysts for Knoevenagel condensation at room temperature in water. Under the effect of the catalyst, various aldehydes or aliphatic ketones could react with a wide range of activated methylene compounds well, including malononitrile, alkyl cyanoacetate, cyanoacetamide, β-diketone, barbituric acid, 2-arylacetonitrile and thiazolidinedione. Furthermore, most of the products could be separated just by filtrating and washing with water. Additionally, the catalyst is recyclable and applicable for the large-scale synthesis.     

Construction of polyheterocyclic spirotetrahydrothiophene derivatives via sulfa-Michael/aldol cascade reaction

A series of polyheterocyclic spirotetrahydrothiophene derivatives were obtained in moderate to excellent yields via a catalyst-free sulfa-Michael/aldol cascade reaction of chalcones 1 and commercially available 1,4-dithiane-2,5-diol 2 under mild conditions. We also present the first asymmetric sulfa-Michael/aldol cascade reaction of chalcones 1 and commercially available 1,4-dithiane-2,5-diol 2 with moderate to good enantioselectivities catalyzed by readily available chiral phase-transfer catalysts (PTCs).     

Suzuki-Miyaura reactions of the soluble guanylate cyclase inhibitor NS2028: a non-product specific route to C-8 substituted analogues

Both soluble guanylate cyclase (sGC) inhibitors ODQ 1 and NS2028 2 are synthesized via improved protocols. In the former case treating 3,4-dihydroquinoxalin-2(1H)-one oxime 8, which can be prepared in two steps from 1,2-benzenediamine, with 1,1′-carbonyldiimidazole (CDI) gives the dihydro-ODQ 10 that in the presence of KMnO₄ oxidises to give ODQ 1 in an overall yield of 46% starting from 1,2-benzenediamine. In the latter case, the synthesis affords NS2028 2 from 2-amino-4-bromophenol 3 in three steps with an overall yield of 85% and avoids the need for chromatography. Furthermore, Suzuki-Miyaura reaction conditions are described that enable the preparation of 8-aryl and 8-heteroaryl derivatives of NS2028 directly from NS2028 2. Finally, demethylation of the 8-(methoxyphenyl) substituted analogues afforded the 8-(hydroxyphenyl) derivatives 40-42. All new products are fully characterised.