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1.
利用水热合成方法合成了1个新的Keggin基有机-无机杂化化合物[Cu2(Dfo)6(SiMo12O40)],并通过元素分析、红外光谱和X射线单晶衍射方法确定了该化合物的晶体结构.结构分析表明该化合物属于立方晶系,Pa-3空间群,晶胞参数a=b=c=2.081 82(3)nm,α=β=γ=90°,V=9.022 6(4)nm3,Z=4,R1=0.064 9,ωR2=0.156 1.将目标化合物制成碳糊电极,利用循环伏安法研究了其电化学行为及其对NO2-还原的电催化性能.  相似文献   

2.
在甲醇与冰醋酸的混合溶剂中通过溶剂蒸发法得到了水杨醛缩1-氨基乙内酰脲的单晶,通过X射线单晶衍射法测定了单晶结构。标题化合物(C48H48N12O20),晶胞参数:a=14.247(12)A,b=7.092(6)A,c=13.302(11)A,α=90.0°,β=108.361(11)°,γ=90.0°,V=1275.6(19)A3,Z=1,R=0.0602,wR=0.1667。该化合物是一种靠分子间氢键形成的立体层状结构的超分子化合物。水杨醛缩1-氨基乙内酰脲中的氧原子及氮原子都具有孤对电子,因而具有与金属离子配位的可能。合成出了4种水杨醛缩1-氨基乙内酰脲的过渡金属配合物,通过元素分析、IR及UV表征了配合物的结构。  相似文献   

3.
N,N’-二羧甲基-2-甲基苯并咪唑内翁盐的合成及晶体结构   总被引:1,自引:0,他引:1  
以2-甲基苯并咪唑为原料,合成了一个新型的苯并咪唑二羧酸衍生物,基结构通过IR,1HNMR,元素分析和X-射线单晶衍射法确定.X射线衍射单晶结构分析表明,固态时标题化合物通过分子间氢键形成一维无限链状结构,这些一维无限链状结构又通过链与链间的苯并咪唑环的π-π堆积作用形成二维结构.标题化合物的晶体属单斜晶系,P21/c空间群;Mr568.54,a=19.821(3),b=7,.4501(11),c=20.093 (3)A,β=116.479(3)°,v=2655.8(3)A3,z=4,Dc=1.422 mg· m-3,F(000)=1200,最终偏离因子R=0.0675,wR=0.2187.  相似文献   

4.
新型苦参碱衍生物的水相合成及其晶体结构(英文)   总被引:1,自引:0,他引:1  
在水相中,以高收率一步合成了13种苦参碱类似物,并借助~1H NMR、~(13)C NMR和HRMS对化合物进行了结构表征.通过X射线单晶衍射分析得到化合物13-(哌啶-1-基)苦参碱(a)、13-(哌啶-1-基)二硫代甲酸苦参碱酯(k)和13-(吗啉-4-基)二硫代甲酸苦参碱酯(m)的精确结构,单晶衍射分析数据显示,三种化合物的结构中都包含5个手性碳原子,其绝对构型分别为5(S),6(S),7(R),11(R),13(S).化合物a单晶结构中含有三个氢键O(2)—H(21B)…N(2),O(2)—H(21A)…O(1)和C(9)—H(9A)…O(1),这些氢键在单晶的形成过程中起着重要的作用.生物活性测试实验显示,所合成的化合物对抑制人结直肠癌细胞SW480、人非小细胞肺癌细胞A549和人表皮鳞癌细胞A431的增殖有一定作用.在苦参碱13位碳上引入氮或硫原子可以提高化合物的抗肿瘤活性.  相似文献   

5.
利用水热合成方法合成了1个新的Keggin基质的超分子化合物(H2bimb)2(SiW12O40),并通过元素分析、红外光谱、热重分析和X射线单晶衍射方法确定了该化合物的晶体结构.结构分析表明该化合物属于三斜晶系,P-1空间群,晶胞参数a=1.122 6(5)nm,b=1.563 5(5)nm,c=1.892 7(5)...  相似文献   

6.
合成了新的三维超分子化合物[NiL2]·H2O(HL为3-醛基水杨酸单缩乙二胺),并借助红外光谱、元素分析、热重分析和X射线单晶衍射等测试手段对其结构进行了表征.单晶结构解析结果表明,标题化合物属于单斜晶系,C2/c空间群,晶胞参数为:a=1.144 5(11)nm,b=1.914 4(19)nm,c=0.978 3(...  相似文献   

7.
利用水热反应合成了一种新的二维双层蜂窝状锌配合物{[Zn2(atz)3(N3)].H2O}n(1)(atz=5-氨基四氮唑),并用元素分析,红外光谱和X-射线单晶衍射对其结构进行了表征,该配合物属单斜晶系,C2/m空间群,晶胞参数为:a=1.0397(2)nm,b=1.7927(4)nm,c=1.109 2(2)nm,V=1.887 0(7)nm3,Z=4。该锌配合物是由N3-和原位合成的5-氨基四氮唑阴离子构成,拓扑分析表明该化合物显示出独特的4-连接六边形的蜂窝双层结构。同时还测定了该化合物的热稳定性及荧光性质。  相似文献   

8.
利用水热合成方法合成了1个新型类杯芳烃修饰的Keggin型超分子化合物Ag6L6(PMo12O40)2(1)(L=5-甲基四氮唑),其中6个5-甲基四氮唑配体和6个银配位形成了类杯[6]芳烃的多核银配合物.通过红外光谱、元素分析和X射线单晶衍射方法确定了该化合物的晶体结构.单晶结构分析表明化合物1属于六方晶系,R-3空间群,晶胞参数a=1.779 0 8(8)nm,b=1.779 0 8(8)nm,c=2.408 8 5(19)nm,α=90°,β=90°,γ=120°,V=6.602 8(7)nm3,Z=3.  相似文献   

9.
以5-氨基四唑为起始原料,经重氮化-硝化、烷基化、肟化、重氮化-氯化、叠氮化和环合等单元反应以19%的总产率合成了一种新型含能化合物5-[(5-硝基-2H-四唑-2-基)甲基]-1H-四唑-1-醇.利用NMR,IR,MS及元素分析等进行了结构表征;利用X射线单晶衍射法测试了该化合物的晶型结构,该化合物属于单斜晶系,空间群P2(1)/c,晶胞参数:a=3.3619(11),b=9.3910(19),c=8.2060(16),β=101.44(3)°,Z=2,Dc=1.748 g·cm-3,μ=0.153 mm-1,F(000)=216;利用差示扫描量热法(DSC)和热重(TG)分析研究了该化合物的热性能,分解温度为202.25℃,热重变化范围130~320℃,总失重78.6%;利用Kamlet-Jacobs公式估算了该化合物的爆轰性能,理论爆速和爆压分别为8500 m·s-1和31.53 GPa.  相似文献   

10.
合成了三维的超分子化合物(BPT)2(Ag2I6)(BPT为1,5-亚戊烷基二吡啶鎓阳离子),并对其进行了元素分析、红外光谱和X-射线单晶衍射测定.结构分析表明,该化合物属单斜晶系,空间群C2/c,晶胞参数a=2.569 14(2)nm,b=1.030 57(7)nm,c=1.682 67(1)nm,β=95.415 ...  相似文献   

11.
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.  相似文献   

12.
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.  相似文献   

13.
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.  相似文献   

14.
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.  相似文献   

15.
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.  相似文献   

16.
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.  相似文献   

17.
An efficient approach to the synthesis of highly congested di, penta and hexacyclic pyrazoles as well as imidazole fragment containing novel heterocyclic molecule has been developed through a carbanion induced transformation of suitably functionalized 2H-pyran-2-ones, benzo[h]chromene and thiochromeno[4,3-b]pyrans. Due to the presence of fluorescence, we report their prime application metal sensor as off/on switching in ferric ions.  相似文献   

18.
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.  相似文献   

19.
20.
Zhanhui Yang  Shiyi Yang  Jiaxi Xu 《Tetrahedron》2017,73(23):3240-3248
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.  相似文献   

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