β—酯基丙基三氯化锡配合物的酯交换反应

β┐酯基丙基三氯化锡配合物的酯交换反应田来进高根之傅芳信（曲阜师范大学化学系２７３１６５）（东北师范大学化学系长春１３００２４）自从Ｃｒｏｗｅ［１］发现有机锡配合物具有良好的抗癌活性以来，人们对有机锡配合物的合成及生物活性产生了极大兴趣［２］。由于许...     

聚乙二醇相转移催化羧酸酯的合成

聚乙二醇相转移催化羧酸酯的合成谢筱娟，杨高升，杨富国，宋雪清（安徽师范大学化学系芜湖２４１０００）关键词聚乙二醇，相转移催化，酰化反应，羧酸酯通常羧酸酯的制备是利用醇与羧酸、酰氯或酸酐反应，但这个方法对有立体位阻的醇不太适宜［１］，为此，为寻找好的方...     

不同催化剂上碳酸乙烯酯与对苯二甲酸二甲酯的酯交换反应

 将碳酸乙烯酯与甲醇酯交换合成碳酸二甲酯的反应和乙二醇与对苯二甲酸二甲酯酯交换合成聚对苯二甲酸乙二醇酯(PET)的反应偶合,建立了同时合成碳酸二甲酯和PET的新方法. 探索了有机锡、钛酸酯、乙酸盐和金属氧化物等不同催化剂对合成碳酸二甲酯和PET的影响. 二丁基氧化锡的催化效果最佳,其碳酸二甲酯的收率达68.4%.     

β—三氯锡基丙酸酯配合物和乙醇的酯交换反应研究

β—三氯锡基丙酸酯配合物和乙醇的酯交换反应研究田来进，田君廉，傅芳信（山东曲阜师大化学系曲阜２７３１６５）（东北师大化学系１３００２４）关键词：β－三氯锡基丙酸酯，配合物，酯交换反应β－三氯锡基丙酸酯是一类新型的聚氯乙烯热稳定剂中间体，其配合物可望具...     

新型有机锡化合物的制备及对酯化反应的催化活性

制备了2种新型有机锡化合物,并利用元素分析、红外光谱、核磁共振测试技术对其进行了表征,研究了它们对酯化反应的催化活性。结果表明,该有机锡化合物是合成酯的优良催化剂,产品收率高,饱和一元羧酸酯的收率为87%~98%,对不饱和羧酸酯和空间位阻大的叔醇酯也能得到较满意的收率,分别为90%~94%和54%~68%。有机锡化合物作为催化剂用量少,并能回收再利用。     

苯酚和草酸二甲酯酯交换合成碳酸二苯酯反应产物的气相色谱-质谱分析

采用气相色谱-质谱联用、程序升温方法对苯酚和草酸二甲酯酯交换合成碳酸二苯酯反应产物进行了分析。实现了对钛酸四丁酯催化苯酚和草酸二甲酯二甲酯酯交换合成草酸二苯酯反应的主产物草酸二苯酯、中间产物甲基苯基草酸酯、副产物丁基苯基草酸酯、2-甲基丁醛、正丁醚及草酸二苯酯脱羰基生成碳酸二苯酯反应产物的定性，验证了苯酚和草酸二甲酯酯交换合成碳酸二苯酯反应分三步进行的反应模式。     

钯催化的有机硼化物与羧酸衍生物的交叉偶联反应

钯催化的交叉偶联反应是构建C—C键的常用方法,近年来,钯催化的有机硼化物与羧酸衍生物的交叉偶联反应已成为偶联反应研究中的热点.本文综述了最近十几年多种有机硼化物与酰氯、酸酐、羧酸、氯甲酸衍生物、羧酸活性酯、羧酸硫酯的交叉偶联反应研究进展,并对该反应在有机合成中的应用进行了讨论.     

Synthesis of Ethyl Methyl Carbonate by Homogeneous Catalysis 均相催化合成碳酸甲乙酯

 利用碳酸二甲酯和碳酸二乙酯进行酯交换反应制备了碳酸甲乙酯,并考察了Ti(OBu)4,Ti(OPh)4,Bu2SnO和BuSnCl3在这一反应中的催化性能. 结果表明,这些催化剂对该反应都有较好的催化性能. 其中,Bu2SnO的催化性能最好,在103 ℃下反应3 h时,碳酸甲乙酯的收率可达45.6%. 提出了Bu2SnO催化剂对碳酸二甲酯与碳酯二乙酯酯交换反应的可能机理.     

钌系双组分催化剂上α,ω—二元羧酸单酯加氢合成ω—羟基羧酸酯的研究

在小型高压反应釜中，研究了钌系双组分催化剂对α，ω－二元羧酸单酯加氢生成ω－羟基羧酸酯的催化性能，结果表明，Ｒｕ－Ｒｅ及Ｒｕ－Ｍｏ双组分催化具有良好的催 氢性能，α，ω十五一酸单甲酯在Ｒｕ－Ｒｅ以及Ｒｕ－Ｍｏ双组分催化剂另氢，生成ω－羟基十五烷酸甲酯的收率分别为８９．０％和７１．０％，反应温度对α，ω二元羧酸单酯加氢生成ω－羟基羧酸酯的收率有较大的影响。     

N,N-二甲基苄胺催化合成丙烯酸间苯二酚环氧酯的机理

Ｎ，Ｎ－二甲基苄胺催化合成丙烯酸间苯二酚环氧酯的机理高俊刚，王洪芳，袁翠红（河北大学化学系，保定０７１００２）关键词丙烯酸间苯二酚环氧酯，Ｎ，Ｎ－二甲基苄胺，催化反应机理不饱和酸环氧酯是由不饱和核酸与环氧化合物进行环氧化反应形成的一种化合物，它在涂料...     

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.     

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.     

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.     

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.