- Temporal emergence of giant vesicles accompanied by hydrolysis of ammonium amphiphiles with a Schiff-base segment
-
An aqueous dispersion of the ammonium amphiphile with a Schiff-base segment exhibited the formation and decomposition of giant vesicles with diameters of several micrometers 2-4 h after the preparation. The time course trace of the morphological changes of the self-aggregates by means of light microscopy, electron microscopy and 1HNMR revealed that the temporal emergence of the giant vesicles was dependent on the progress of hydrolysis of the Schiff-base segment.
- Toyota, Taro,Takakura, Katsuto,Sugawara, Tadashi
-
-
Read Online
- Heterobicyclic sphingosine 1-phosphate analogs
-
Compounds that have agonist activity at one or more of the S1P receptors are provided. The compounds are sphingosine analogs that, after phosphorylation, can behave as agonists at S1P receptors.
- -
-
-
- Fulleropyrrolidine end-capped molecular wires for molecular electronics-synthesis, spectroscopic, electrochemical, and theoretical characterization
-
In continuation of previous studies showing promising metal-molecule contact properties a variety of C60 end-capped "molecular wires" for molecular electronics were prepared by variants of the Prato 1,3-dipolar cycloaddition reaction. Either benzene or fluorene was chosen as the central wire, and synthetic protocols for derivatives terminated with one or two fullero[c]pyrrolidine "electrode anchoring" groups were developed. An aryl-substituted aziridine could in some cases be employed directly as the azomethine ylide precursor for the Prato reaction without the need of having an electron-withdrawing ester group present. The effect of extending the π-system of the central wire from 1,4-phenylenediamine to 2,7-fluorenediamine was investigated by absorption, fluorescence, and electrochemical methods. The central wire and the C60 end-groups were found not to electronically communicate in the ground state. However, the fluorescence of C60 was quenched by charge transfer from the wire to C60. Quantum chemical calculations predict and explain the collapse of coherent electronic transmission through one of the fulleropyrrolidine-terminated molecular wires.
- Sorensen, Jakob Kryger,Fock, Jeppe,Pedersen, Anders Holmen,Petersen, Asger B.,Jennum, Karsten,Bechgaard, Klaus,Kilsa, Kristine,Geskin, Victor,Cornil, Jerome,Bjornholm, Thomas,Nielsen, Mogens Brondsted
-
supporting information; experimental part
p. 245 - 263
(2011/03/20)
-
- HETEROBICYCLIC SPHINGOSINE 1-PHOSPHATE ANALOGS
-
Compounds that have agonist activity at one or more of the SlP receptors are provided. The compounds are sphingosine analogs that, after phosphorylation, can behave as agonists at SlP receptors.
- -
-
Page/Page column 61
(2010/05/14)
-
- Liquid-crystalline polymorphism of symmetrical azobananas: Bis(4-(4-alkylphenyl)azophenyl) 2-nitroisophtalates
-
In this paper we present a series of novel compounds, bis(4-(4-alkylphenyl) azophenyl) 2-nitroisophtalates, which exhibit nematic and banana-type liquidcrystalline phases. The alkyl chain length varies from 1 to 18 carbons. The first ten members of this series exhibit nematic phase. The last eleven compounds exhibit banana-type liquid crystalline phases. The propyl and pentyl derivatives have extra second type of banana mesophase. Copyright Taylor & Francis Group, LLC.
- Zygadlo,Dardas,Nowicka,Hofmann,Galewski
-
scheme or table
p. 283 - 291
(2011/08/02)
-
- Palladium- and nickel-catalyzed cross-couplings of unsaturated halides bearing relatively acidic protons with organozinc reagents
-
(Chemical Equation Presented) A wide range of polyfunctional aryl, heteroaryl, alkyl, and benzylic zinc reagents were coupled with unsaturated aryl halides bearing an acidic NH or OH proton, using Pd(OAc)2 (1 mol %) and S-Phos (2 mol %) as catalyst without the need of protecting groups. A similar nickel-catalyzed reaction is described. The relative kinetic basicity of organozinc compounds as well as their stability toward acidic protons is also described.
- Manolikakes, Georg,Munoz Hernandez, Carmen,Schade, Matthias A.,Metzger, Albrecht,Knochel, Paul
-
supporting information; experimental part
p. 8422 - 8436
(2009/04/11)
-
- Hydrophobic effects in duplexes with modified oligonucleotide backbones and RNA
-
The incorporation of hydrophobic substituents on the amide functionality of modified oligonucleotides drastically influences the thermal stability of the corresponding duplexes with the RNA complement.
- Waldner, Adrian,De Mesmaeker, Alain,Wendeborn, Sebastian
-
p. 2363 - 2366
(2007/10/03)
-
- Palladium-Catalyzed Cross-Coupling Reaction of Organoboron Compounds with Organic Triflates
-
The cross-coupling reaction of 9-alkyl-9-borabicyclononane (9-R-9-BBN), 1-alkenyl-1,3,2-benzodioxaborole, or aryl boronic acid with 1-alkenyl or aryl triflates in the presence of K3PO4 (1.5 equiv) and a catalytic amount of Pd(PPh3)4 or Cl2Pd(dppf) resulted in high yields.The reaction conditions are sufficiently mild so that a variety of functionalized alkenes, alkadienes, and arenes are readily obtained.The utility of the present reaction was demonstrated by the cyclization of ω-alkenyl triflates leading to a benzo-fused cycloalkene and bicyclic alkene via a hydroboration intramolecular coupling sequence.
- Oh-e, Takayuki,Miyaura, Norio,Suzuki, Akira
-
p. 2201 - 2208
(2007/10/02)
-
- LIQUID CRYSTALLINE PROPERTIES OF 4-CHLOROBENZYLIDENE-4-AKYLANILINES
-
A new group of Schiff bases containing a polar terminal group was synthesized: .The alkyl was changed from n=1 to n=12.Based on calorimetric (DSC) studies and on observations of textures the phase situation was characterized.
- Galewski, Zbigniew
-
p. 233 - 242
(2007/10/02)
-
- Study of the Influence of Molecular Length on the Characteristics of the Ordered Smectic Phase.
-
Study of DTA and X-rays of p-phenyl-benzylidene-p'-alkylanilines of mesomorphic phases demonstrates the predominant role of the aliphatic chain length. In effect, it governs the appearance of the different phases; the correlation between layers decreases for greater chain lengths. The nonlinear variations of SmB layer thickness for these compounds shows clearly the importance of steric effects coupled with the molecular length with respect to the dipolar effect.
- Benattar,Levelut,Strzelecki
-
p. 1233 - 1240
(2007/10/05)
-
- Manufacture of aromatic amino compounds
-
A process for producing an aromatic amine comprises heating an aromatic sulfonate and a metal amide in liquid ammonia in a closed reactor at a temperature of at least 40° C to produce a metal arylamide and reacting the resultant metal arylamide with water or lower aliphatic alcohol to produce an aromatic amine.
- -
-
-