- High-pressure studies on fluorine substituted 2,5-di(phenyl)-1,3,4- oxadiazoles
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Results are presented from structural and high-pressure investigations on four differently but symmetrically fluorine substituted 2,5-di(phenyl)-1,3,4- oxadiazoles. The substitution pattern includes the para-, meta-, or ortho-substitution and the fully fluorinated 2,5-bis(pentafluorophenyl)-1,3,4- oxadiazole. The crystal structure depends on the molecular structure and results in a different high-pressure behavior. Parameters for the Murnaghan equation of state (EOS) are determined for every compound and the anisotropic pressure response of the crystal lattice is discussed. Although the EOS parameters, bulk modulus Ko and its pressure derivative Ko′ are of the same order of magnitude for all four compounds, the anisotropy of strain is noticeably different.
- Orgzall, Ingo,Franco, Olga,Reck, Günter,Schulz, Burkhard
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- A unique stepped multifunctionality of perfluorinated aryl compound and its versatile use in synthesizing grafted polymers with controlled structures and topologies
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A unique stepped multifunctionality of perfluorinated aryl compound for the first time was studied by using model reactions between 2,5- dipentafluorophenyl-1,3,4-oxadiazole (FPOx) and mono functional p-cresol at different reaction conditions. Four distinctively different levels of reactivity were discovered for the para and ortho C-F of FPOx, which could be easily triggered by the reaction temperature in the range of r.t. to 160 °C. C-F of all levels of reactivity could react quantitatively with nucleophiles (such as phenoxide); and by controlling the reaction conditions, the low-level-reactivity C-F would not interfere with the reaction of C-F of higher reactivity. Application of this multistepped reactivity of FPOx in quantitative postpolymerization functionalization of polymer was successfully demonstrated. Stoichiometric amount of p-cresol, with the molar feed ratio of p-cresol in relative to the repeat unit of the polymer of FPOx and 6F-BPA in the range of 1-4, could be readily grafted onto the polymer by simply controlling the reaction temperature. FPOx-based, versatile one-pot synthesis of high molecular-weight grafted polymers with well-controlled structures and topologies were also demonstrated.
- Zhao, Zhenhua,Ma, Xiaohua,Zhang, Aixin,Song, Naiheng
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experimental part
p. 2423 - 2433
(2012/04/23)
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- Fluorine-containing compound
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The present invention has an object to provide a fluorine-containing compound which can be used for applications such as additives making a transparent resin material low in a water absorbing ratio and high in water repellency without deteriorating of var
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Page/Page column 30
(2009/09/26)
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- Syntheses and insecticidal activities of novel 2,5-disubstituted 1,3,4-oxadiazoles
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Nine novel symmetrical and asymmetrical 2,5-disubstituted 1,3,4-oxadiazoles have been synthesized by a facile and mild method with high yield. Meantime, it was found that the fluorine was easy substituted by hydrazine in polyhalogen-substituted aroyl hydrazine. The preliminary bioassay tests show that two of the compounds (D5> and D6) exhibited a significant insecticidal activity (LC50=116.02 and 70.93 mg l-1) on armyworm, Leucania separata Walker. Using the Drug Discovery Workbench (DDW) (Cerius2), structure-activities relationship was studied.
- Zheng, Xiumian,Li, Zhong,Wang, Yanli,Chen, Weidong,Huang, Qingchun,Liu, Chuanxiang,Song, Gonghua
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p. 163 - 169
(2007/10/03)
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