Synthesis of Polyfunctionalized Biphenyls as Intermediates for a New Class of Liquid Crystals
摘要:
A series of hexa- and octasubstituted biphenyls containing halogen, amino, nitro, and propylthio substituents were prepared by metal-mediated convergent synthesis from halobenzene precursors. The Pd-assisted C-C coupling methods were ineffective in the formation of the Ar-Ar bond except for the synthesis of 1b. All tetra-ortho-substituted biphenyls were prepared via Ullmann coupling reactions. The halogens were introduced after formation of the biphenyl by utilizing the directing properties of the amino group(s). In the case of 3b, a polyhalogenated benzene substrate was used for biphenyl formation via Ullmann coupling.
Orthohalogen substituents dramatically enhance hydrogen bonding of aromatic ureas in solution
作者:Ilaria Giannicchi、Benjamin Jouvelet、Benjamin Isare、Mathieu Linares、Antonella Dalla Cort、Laurent Bouteiller
DOI:10.1039/c3cc47447j
日期:——
The phenylurea moiety is a ubiquitous synthon in supramolecular chemistry. Here we report that the introduction of chlorine or bromine atoms in the ortho positions to the urea unit is a simple and very efficient way to improve its intermolecular hydrogen bond (HB) donor character. This effect was demonstrated in solution both in the context of self-association of bis-ureas and hydrogen bonding of mono-ureas to strong HB acceptors.
ORGANIC ELECTROLUMINESCENCE DEVICE AND POLYCYCLIC COMPOUND FOR ORGANIC ELECTROLUMINESCENCE DEVICE
申请人:SAMSUNG DISPLAY CO., LTD.
公开号:US20200044159A1
公开(公告)日:2020-02-06
An organic electroluminescence device includes a first electrode, a hole transport region on the first electrode, an emission layer on the hole transport region, the emission layer including a condensed polycyclic compound of three or more six-membered rings, at least two six-membered rings among the six-membered rings including an electron donor moiety and an electron acceptor moiety at facing positions, respectively, the at least two six-membered rings not being immediately adjacent to each other, an electron transport region on the emission layer, and a second electrode on the electron transport region.
A Convenient and Efficient Synthesis of Polyphenylmono-, di-, and -triaminobenzenes
作者:Yozo Miura、Hiroyuki Oka、Masayoshi Momoki
DOI:10.1055/s-1995-4113
日期:1995.11
A new convenient and efficient synthesis of polyphenylmono- and -diaminobenzenes by the palladium(0)-catalyzed cross-coupling reaction of polyhalomono- and -diaminobenzenes with phenylboronic acid is described. A synthesis of 2,4-diphenyl-1,3,5-triaminobenzene is also reported.
Anti-bacterial polymer and method for the preparation thereof, anti-bacterial polymer film and method for the preparation thereof, and article having such a film on the surface thereof
申请人:ULVAC, INC.
公开号:EP1396514A1
公开(公告)日:2004-03-10
An anti-bacterial polymer of the present invention consists of a vapor deposition-polymerization reaction product of a diaminobenzoic acid monomer or halogen atom-containing diamine monomer and a monomer reactive with these monomers. The anti-bacterial polymer can be prepared by a method, which comprises the step of subjecting a gas obtained by evaporating a diaminobenzoic acid monomer or halogen atom-containing diamine monomer and a gas obtained by evaporating a monomer reactive with these monomers to vapor deposition-polymerization, in a vacuum, to thus form an anti-bacterial polymer. The method permits the formation of a film having a desired thickness even on the surface having a complicated shape such as the surface of, for instance, a heat exchanger.
A vesicle incorporate a transmembrane protein, the vesicle forming material including a mixture of poly(ethylene glycol)-block-poly(propylene glycol)-block-poly(ethylene glycol) and polyetheramine. The vesicle can generally withstand elevated temperature without substantial shrinkage of the diameter, which in turn results in maintenance of the water permeability virtually unaffected. Pluronic based vesicles have a large content of amino groups available on the surface illustrated by the larger zeta potential values available for crosslinking in the polyamide layer by chemical reaction with trimesoyl chloride (TMC).