2444-21-5Relevant academic research and scientific papers
Enol Ester Intermediate Induced Metal-Free Oxidative Coupling of Carboxylic Acids and Arylboronic Acids
Xu, Xianjun,Feng, Huangdi,Li, Huiqiong,Huang, Liliang
, p. 3921 - 3928 (2019/06/24)
A facile, efficient and environmentally friendly methodology for the preparation of phenolic esters is realized via metal-free coupling of carboxylic acids and arylboronic acids. This sequential one pot reaction, employing methyl propiolate as an activating reagent, proceeds through the formation of enol ester intermediate, followed by a nucleophilic attack on the C-O bond under the oxidation of hydrogen peroxide. These studies display that enol esters, despite previously being overlooked as synthetic intermediates, would be the valuable building blocks for developing carbon–carbon and carbon–heteroatom bond-forming reactions.
Metal-free synthesis of aryl esters by coupling aryl carboxylic acids and aryl boronic acids
Ruso, Jayaraman Sembian,Rajendiran, Nagappan,Kumaran, Rajendran Senthil
supporting information, p. 2345 - 2347 (2014/05/06)
A facile synthesis of aryl esters is developed by coupling aryl carboxylic acids and aryl boronic acids in the presence of PhI(OAc)2 and carbonyl diimidazole. A wide range of functional groups were tolerant to the metal-free reaction condition that led to the desired products in good yields.
Synthesis and properties of 2-phenylbenzoxazole-based luminophores for in situ photopolymerized liquid-crystal films
Gimenez, Raquel,Oriol, Luis,Pinol, Milagros,Serrano, Jose Luis,Vinuales, Ana I.,Fisher, Thomas,Stumpe, Joachim
, p. 304 - 319 (2007/10/03)
We report the synthesis of a series of blue-emitting 2-phenylbenzoxazoles (PBOs) substituted at either the 5- or 6-position of the benzoxazole ring and the para-position of the phenyl substituent. The thermal and optical properties of the materials can be rationalized in terms of the position of the substituent at the benzoxazole moiety and the electron-withdrawing or electron-donating character of the substituents. From the results, we conclude that the combination of an electron-donating substituent at the benzoxazole fragment and an electron-withdrawing one at the phenyl fragment has a more marked effect on the electronic properties of the aromatic PBO core than other possibilities. This particular combination gives luminophores that are suitable for optical applications on the basis of their high emission efficiency and photostability. In view of that, oriented films were prepared by in situ polymerization of a mixture of a liquid crystalline direactive matrix containing 5% (w/w) of the luminophore. The films exhibit linearly polarized emission.
Dihalopropene compounds, insecticidal/acaricidal agents containing same, and intermediates for their production
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, (2008/06/13)
The dihalopropene compounds of the general formula ?I! have excellent insecticidal/acaricidal activity, so that they are satisfactorily effective for the control of noxious insects, mites and ticks.
Preparation of a novel cross-linked polymer for second-order nonlinear optics
Trolls?s, Mikael,Orrenius, Christian,Sahlén, Fredrik,Gedde, Ulf W.,Norin, Torbj?rn,Hult, Anders,Hermann, David,Rudquist, Per,Komitov, Lachezar,Lagerwall, Sven T.,Lindstr?m, Jan
, p. 8542 - 8548 (2007/10/03)
A novel cross-linked pyroelectric polymer with pronounced second-order nonlinear optical properties has been prepared. A multistep synthesis with several selective transformations including a kinetic resolution (transesterification) with the highly enantioselective Candida antarctica lipase B, yielded the monomer 4''-{(R)-(-)-2[(10-acryloyloxy)decyl]oxy}-3-nitrophenyl 4-{4'-[(11-acryloyloxy)undecyloxy]phenyl}benzoate A2c which displayed a ferroelectric chiral smectic C phase with large spontaneous polarization (175 nC/cm2). The monomer was poled and subsequently cross-linked by in-situ photopolymerization in the surface-stabilized ferroelectric liquid crystalline state. The cross-linked pyroelectric polymer exhibited an electro-optical coefficient (r22-r12) of 15-35 pm/V.
Use of substituted isopropylaminopropanols for inducing inotropic effects of the human heart
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, (2008/06/13)
A method for inducing increased inotropic effects of the human heart without inducing arrhythmogenic effects, but providing an antiarrhythmogenic effect therein. The method is effected by administering to mammals, including man, a compound of the formula STR1 wherein R is selected from the group consisting of hydrogen or STR2 wherein R' is selected from the group consisting of straight or branched aliphatic alkyl having 1 to 7 carbon atoms, phenyl, benzyl, and phenylethyl, wherein the phenyl nucleus may be further substituted with alkyl having 1 to 4 carbon atoms, alkoxy having 1 to 4 carbon atoms, alkoxyalkyl having 2 to 8 carbon atoms or halogen, in any position.
