伯胺N_(1923)与中性磷萃取剂对Zn(Ⅱ)的协同萃取

本文研究了仲碳伯胺N_(1923)与中性磷萃取剂的正庚烷溶液,从盐酸介质中对Zn(Ⅱ)的协同萃取。用斜率法及等摩尔系列法确定协萃配合物的组成为:(RNH_3Cl)_3·ZnCl_2·TBP、(RNH_3Cl)_2·ZnCl_2·DBBP,求得协萃反应的平衡常数分别为logK_(12)(TBP)=3.09,logK_(12)(DBBP)=2.90,协萃配合物的生成常数分别为logβ_(12)(TBP)=1.34,logβ_(12)(DBBP)=1.90.计算了协萃反应的热力学函数值,并对协萃配合物的IR、NMR谱进行了讨论。     

β—三氯化锡基丙烯酸甲酯与Schiff碱配合物分解反应及产物结构表征

将酯基锡 Me O2 CCH2 CH2 Sn Cl3( 1 )与 Schiff碱 ( 2 -HOC6 H4CH NC6 H5) ( 2 )反应合成配合物Me O2 CCH2 CH2 Sn Cl3· ( 2 -HOC6 H4CH NC6 H5) ( 3) ,在其反应混合液放置过程中发生分解生成酯基锡与无机氯离子形成的配合物 Me O2 CCH2 CH2 Sn Cl4- · H+ ( 4)和酯基锡与 Schiff碱的酚氧负离子取代生成的配合物Me O2 CCH2 CH2 Sn Cl2 · ( 2 -OC6 H4CH NC6 H5) ( 5 ) .用元素分析、IR及 NMR对配合物 3,4 ,5进行了表征 ,并对配合物 4的晶体结构进行了解析 .配合物 4为正交晶系 ,空间群 P2 cn,a=0 .785 2 ( 2 ) nm ,b=1 .2 2 36( 1 0 ) nm,c=1 .695 2 ( 4) nm,α=β=γ=90°,V=1 .62 87nm3,Z=4 ,Dc=1 .79g/ cm3,F ( 0 0 0 ) =860 ,μ=2 2 .2 cm- 1 ( Mo) ,R=0 .0 4 49,ωR=0 .0 382 .配合物 4的空间构型为畸变的八面体构型 ,中心锡原子的配位数为 6.配合物 5为 Schiff碱中的酚氧负离子取代配合物 1中的一个氯离子形成的配合物 ,锡原子的配位数为 5     

四种新型柔性吡啶基配合物的合成、结构及配体构象与配合物结构的关系

合成了柔性配体3-吡啶甲酸-1,2-乙二酯(3-pyridinecarboxylic acid 1,2-ethanediyl ester,pcaede),并将其分别与Co盐和Hg盐进行组装,得到4个新配合物[Co(pcaede)2Cl2.2CH3CN.H2O]n(1),[Co(pcae-de)2Cl2.H2O]n(2),[Hg(pcaede)I2]n(3)和[Hg(pcaede)Br2]n(4),对其进行了元素分析、红外光谱及X射线单晶结构分析.配合物1和2为含有孔道的一维链状结构,配合物3是1D内消旋螺旋链,配合物4则是锯齿形1D链状结构.研究结果显示,孔道中填充的溶剂分子和平衡阴离子对配合物的组装有显著的影响.此外对4个配合物中配体的构象进行了理论计算.     

Schiff碱单核及双核配合物拟酶催化性能的研究

系统地研究了新型Schiff碱单核及双核配合物在拟酶催化PhIO单加氧化环己烷反应中的催化性能.结果表明,双核配合物MnML{M=Mn(Ⅱ),Fe(Ⅲ)Cl,Cr(Ⅲ)Cl,Cu(Ⅱ),Co(Ⅱ),Ni(Ⅱ),Zn(Ⅱ);L=双[N,N'亚乙基2,2'(苯亚甲基)二(3,4二甲基吡咯5醛缩亚胺)]}的催化活性比对应的单核配合物MnH₂L与MH₂L之混合物的催化活性高.因此,我们认为在双核配合物中两金属离子间存在协同作用,并发现这种协同作用一般随双核配合物中成单d电子数增加而增大.     

新型氯桥连一维链结构Cd(Ⅱ)配位聚合物的合成、结构及蓝光性能

利用2-乙酰基吡啶(acpy)和2-邻甲基苯胺在甲醇中回流反应得到新型希夫碱配体2-{1-[(2-甲基苯基)亚氨基]-乙基}吡啶)(mpep),通过溶剂热法将acpy和mpep与氯化镉反应得到2种新型氯桥连一维之字链结构Cd(Ⅱ)配位聚合物{[Cd(mpep)]Cl2}n(配合物1)和{[Cd(acpy)]Cl2}n(配合物2).利用单晶X射线衍射、核磁共振氢谱、元素分析和红外光谱对配合物1和配合物2进行结构表征.结果表明,配合物1和配合物2均为一维之字链状结构.在配合物1中,Cd与mpep配体中2个氮原子和4个氯原子配位,呈六配位顺式八面体构型,并通过2个Cl原子桥连形成一维之字链状结构.在配合物2中,中心金属Cd(Ⅱ)与acpy中的氮原子、氧原子和4个氯原子配位,也呈六配位顺式八面体构型,进一步通过Cl原子桥连相邻金属形成一维之字链状结构.在3种不同极性的溶剂(CH3OH,CH3CN和CH2Cl2)中,两种配位聚合物均呈现蓝色荧光(390~433 nm),说明2种配位聚合物具有弱溶剂效应;在固态室温下两种配位聚合物也呈现蓝色荧光,最大发射波长分别为440和473 nm.固态最大发射波长比溶液中红移的原因是分子中存在氢键,降低了基态与激发态之间的能级差.在室温下,配合物1和配合物2在3种溶液和固态中均显示出较长的荧光寿命(19.08~60.20μs).     

酰腙类Schiff碱汞(Ⅱ)配合物的合成及晶体结构

合成了Schiff碱配体3-乙酰吡啶缩邻氨基苯甲酰腙(L1)及4-乙酰吡啶缩邻氨基苯甲酰腙(L2),并分别与Hg Cl2进行了配位反应,得到2个配位聚合物{[Hg(L1)Cl2]·CH3OH}n(1)和[Hg(L2)Cl2]n(2),采用1H NMR、FTIR和元素分析等手段对化合物进行了表征,并对配合物的热稳定性进行了考察。通过X射线单晶体衍射技术测定了2个配合物的单晶结构,结构解析表明,配合物1属于三斜晶系,P1空间群,配合物2属于单斜晶系,P21/n空间群。     

高氮含能配合物M(ATZ)(bpy)m·nH2O液相生成反应的热动力学

合成了6种固态高氮含能配合物M(ATZ)(bpy)m·nH2O((1)M=Mn,m=2,n=3;(2)M=Co,m=2,n=7;(3)M=Ni,m=2,n=0;(4)M=Cu,m:1,n=0;(5)M=Pb,m=1,/7,=3;(6)M=Zn,m=1,n=1;ATZ=5,5'-偶氮四唑,bpy=2,2'-联吡啶).对它们的结构和性能进行了表征.用RD496-CK2000微热量计测定了298.15 K下各配合物的液相生成反应焓变分别为:△rHc(1)=241.245 4-0.060 kJ/mol,△rHθ≠(2)=-256.875±0.050 kJ/tool,△rHθm.(3)=-265.172±0.038 kJ/mol,△rHθm:(4)=-236.538±0.038 kJ/tool,△rθm(5)=-249.698±0.038 kJ/mol,△rθm(6)=-185.072±0.048 kJ/tool.通过试验测定得到的所有液相反应的△rθm均为负值,有利于目标物生成;并改变反应温度,研究了它们的液相生成反应的热动力学.改变温度研究了液相生成反应的热动力学,利用反应热化学数据和动力学方程结合热动力学实验数据计算了活化焓(△Hθ≠)、活化熵(△Sθ≠)、活化自由能(△Gθ≠)、表观反应速率常数(k)、表观活化能(E)、指前常数(A)和反应级数(N).     

胍基锆酰胺配合物与四氯化碳的反应生成氯化锆胍基衍生物（英文）

四氯化碳与Zr(NMe_2)_2[~iPr NC(NMe_2)N~iPr]_2(1)反应先生成中间体Zr Cl(NMe_2)_2[~iPr NC(NMe_2)N~iPr]_2(2),然后生成Zr Cl_2[~iPr NC(NMe_2)N~iPr]_2(3)。该反应可能是自由基反应。另外,配合物2可由Zr Cl(NMe_2)_3与二异丙基碳二亚胺~(i )Pr-N=C=N-~iPr反应制备。对配合物2进行了核磁共振(NMR)和元素分析。     

[2-(2-羟基苯基)亚氨甲基苯硫酚根(2-)-N,O,S](2-甲氧羰基乙基-C,O)氯化锡的合成及性质

利用 2 -甲氧羰基乙基三氯化锡与硫代水杨醛缩邻氨基苯酚 (H2 L)进行反应合成了标题配合物 [2 -(2 -羟基苯基 )亚氨甲基苯硫酚根 (2 -) -N,O,S](2 -甲氧羰基乙基 -C,O)氯化锡 CH3OCOCH2 CH2 Sn Cl L(L=2 -SC6 H4 CH NC6 H4 O-2 ) ,该配合物与二甲基亚砜 (DMSO)、六甲基磷酰胺 (HMPA)等单齿配体反应生成混配配合物 CH3OCOCH2 CH2 Sn Cl LL′(L′=DMSO,HMPA) ,与醇 (ROH)反应生成相应的 2 -烷氧羰基乙基锡配合物 ROCOCH2 CH2 Sn Cl L.通过元素分析、红外光谱、核磁共振谱等对配合物的结构进行了表征 .用 X射线单晶衍射测定了标题配合物的晶体结构 ,晶体属三斜晶系 ,P1空间群 ,Z=2 ,晶胞参数 a=0 .870 4(2 )nm,b=0 .93 93 (3 ) nm,c=1 .45 1 1 (3 ) nm,α=98.0 5 (3 )°,β=1 0 3 .0 3 (3 )°,γ=96.99(3 )°.该配合物具有分子内羰基氧原子和配体 L的硫、氮、氧原子对锡原子配位的畸变八面体结构 .     

氯化钆与L-酪氨酸和甘氨酸三元固态配合物的热化学及热分解动力学研究

合成表征了氯化钆与L 酪氨酸和甘氨酸形成的三元固态配合物Gd(Tyr) (Gly) 3 Cl3 ·3H2 O .用具有恒温环境的溶解 -反应热量计 ,测定了配位反应GdCl3 ·6H2 O (s) +Tyr (s) +3Gly (s) =Gd(Tyr) (Gly) 3 Cl3 ·3H2 O (s) +3H2 O (l)在 2 98.15K时的反应焓为 ( 9.45 1± 0 .468)kJ·mol-1 .计算得配合物Gd(Tyr) (Gly) 3 Cl3 ·3H2 O (s)在 2 98.15K时的标准摩尔生成焓为ΔfH m =-( 4 2 69.7± 2 .3 )kJ·mol-1 .并用热分析手段对配合物进行了非等温热分解动力学研究 ,推断配合物第二步热分解反应机理为二级化学反应 ,其动力学方程为 :dα/dT =(A/β)exp( -E/RT) ( 1-α) 2 ,求得分解反应的表观活化能为E =2 15 .17kJ·mol-1 ,指前因子为 10 1 8.71 s-1 .     

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.