Oxidation products of fused 2-hetarylimidazole derivatives
摘要:
Oxidation of 5-(1-methyl-1H-benzimidazol-2-yl)thiophene-, and -selenophene-2-carbaldehydes with potassium dichromate in 20% aqueous sulfuric acid afforded the corresponding carboxylic acids. Analogous reaction with 5-(1-methyl-1H-benzimidazol-2-yl)furan-2-carbaldehyde led to the formation of 1-methyl-1H-benzimidazole as a result of decarboxylation of the primary oxidation product and subsequent decomposition of the furan ring. Probable factors responsible for instability of 5-(1H-benzimidazol-2-yl)-hetarene-2-carboxylic acids were considered. The oxidation of 2-furylnaphtho[2,3-d]- and 2-hetarylphenanthro-[9,10-d]imidazoles gave, respectively, an anthraquinone analog and 6,7-quinones. pi-Electron-rich heterocycles in 2-furyl- and 2-pyrrolylphenanthro[9,10-d]imidazoles were oxidized completely, being replaced by hydrogen.
Oxidation products of fused 2-hetarylimidazole derivatives
摘要:
Oxidation of 5-(1-methyl-1H-benzimidazol-2-yl)thiophene-, and -selenophene-2-carbaldehydes with potassium dichromate in 20% aqueous sulfuric acid afforded the corresponding carboxylic acids. Analogous reaction with 5-(1-methyl-1H-benzimidazol-2-yl)furan-2-carbaldehyde led to the formation of 1-methyl-1H-benzimidazole as a result of decarboxylation of the primary oxidation product and subsequent decomposition of the furan ring. Probable factors responsible for instability of 5-(1H-benzimidazol-2-yl)-hetarene-2-carboxylic acids were considered. The oxidation of 2-furylnaphtho[2,3-d]- and 2-hetarylphenanthro-[9,10-d]imidazoles gave, respectively, an anthraquinone analog and 6,7-quinones. pi-Electron-rich heterocycles in 2-furyl- and 2-pyrrolylphenanthro[9,10-d]imidazoles were oxidized completely, being replaced by hydrogen.
Induction-Driven Stabilization of the Anion-π Interaction in Electron-Rich Aromatics as the Key to Fluoride Inclusion in Imidazolium-Cage Receptors
作者:Zhaochao Xu、N. Jiten Singh、Sook Kyung Kim、David R. Spring、Kwang S. Kim、Juyoung Yoon
DOI:10.1002/chem.201002105
日期:2011.1.24
experimental evidence of the anion–πinteraction between electron‐rich alkylbenzene rings and a fluoride ion in CH3CN. The cyclophane cavity bridged with three naphthoimidazolium groups selectively complexes a fluoride ion by means of a combination of anion–πinteractions and (CH)+⋅⋅⋅F−‐type ionic hydrogen bonds. 1H NMR, 19F NMR, and fluorescence spectra of 1 and 2 with fluoride ions are examined to show
涉及芳香环的分子间相互作用是化学和生物识别中的关键过程。众所周知,阴离子与缺电子的(π酸性)芳族化合物之间存在阴离子-π相互作用,这表明富含电子的(π-碱性)芳族化合物由于其给电子性而会排斥阴离子。在这里,我们报告了CH 3 CN中富电子的烷基苯环与氟离子之间阴离子-π相互作用的第一个具体理论和实验证据。所述环芳空腔具有三个naphthoimidazolium基团桥连的由阴离子-π相互作用的组合来选择性地络合氟化物离子和(C 1H)+ ⋅⋅⋅ ˚F -型离子氢键。通过1 H NMR,19 F NMR以及带有氟离子的1和2的荧光光谱进行了研究,结果表明只有2个可以在两个烷基苯环之间的空腔中形成一个氟离子,从而形成三明治复合物。此外,笼状化合物可以用作氟离子的高选择性和比例式荧光传感器。通过加入1个当量的F的-中,强烈增加的荧光发射中心在385所纳米处出现的荧光发射为代价2在474纳米为中
Targeting DNA with small molecules: a comparative study of a library of azonia aromatic chromophores
作者:Rosa M. Suárez、Pedro Bosch、David Sucunza、Ana M. Cuadro、Alberto Domingo、Francisco Mendicuti、Juan J. Vaquero
DOI:10.1039/c4ob01465k
日期:——
The fluorescence, DNA binding and DNA sequence selectivity properties of a library of azonia aromatic cations have been studied.
一组芳香偶氮阳离子的荧光、DNA结合和DNA序列选择性性质已被研究。
6-Beta(substituted)-(S)-hydroxymethylpenicillanic acids and derivatives thereof
申请人:PFIZER INC.
公开号:EP0276942A1
公开(公告)日:1988-08-03
Antibacterial penicillins of the formula
or a pharmaceutically acceptable salt thereof wherein R1 is a heterocyclic group and R is hydrogen, the residue of certain carboxy protecting groups or the residue of an ester group readily hydrolyzable in vivo having activity against resistant organisms.
ORGANIC ELECTRIC FIELD LIGHT EMITTING ELEMENT AND PRODUCTION THEREFOR
申请人:Yabe Masayoshi
公开号:US20090066223A1
公开(公告)日:2009-03-12
A composition for an organic electroluminescent device is a composition for forming an organic light emitting layer of an organic electroluminescent device by wet coating process. The composition contains a phosphorescent material, a charge transport material, and a solvent, in which the phosphorescent material and the charge transport material are each an unpolymerized organic compound, and the first oxidation potential of the phosphorescent material E
D
+
, the first reduction potential of the phosphorescent material E
D
−
, the first oxidation potential of the charge transporting material E
T
+
, and the first reduction potential of the charge transporting material E
T
−
satisfy the following condition: E
T
−
+0.1≦E
D
−
AZO METAL CHELATE DYE AND OPTICAL RECORDING MEDIUM
申请人:Shoda Hisashi
公开号:US20110069595A1
公开(公告)日:2011-03-24
To provide a dye to be used for an optical recording medium excellent in both high speed recording characteristics and reproduction durability.
A dye having an azo compound represented by the following formula coordinated to a metal ion:
wherein the ring A represents a nitrogen-containing heteroaromatic ring containing a carbon atom and a nitrogen atom; X represents C—R
1
R
2
, an oxygen atom, a sulfur atom or N—R
3
, wherein each of R
1
, R
2
and R
3
which are independent of one another, represents a hydrogen atom, a linear or branched alkyl group, an aralkyl group, a cycloalkyl group, a linear or branched alkenyl group, an aryl group or an acyl group represented by —COR
4
, wherein R
4
is a hydrocarbon group or a heterocyclic group which may be substituted; and the benzene ring B represents a benzene ring which may have a substituent(s), provided that adjacent substituents in the benzene ring B may be mutually bonded to form a ring.