- BORON OR ALUMINUM COMPLEXES
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The present invention relates to boron and aluminum complexes, to the preparation thereof, and to the use thereof for solubilizing ionic compounds. The complexes have one of the following formulae: in which D represents B or Al; R1 represents R, RF, NO2, CN, C(═O)OR, RSO2, or RFSO2; —X1—, —X2—, —X3— and X4 each represent a divalent group >C═O, >C═NC≡N, >C═C(C≡N)2, >CR2R3 or >SO2; —Y1—, —Y2— and —Y3— each represent a divalent group —O—, >N(C≡N), >N(CORF), >N(SO2R4), >NR4, >N(COR4) or >N(SO2RF); R, R2 and R3 each represent H, an alkyl group, an aryl group, an alkylaryl group, an arylalkyl group, an oxaalkyl group or an alkenyl group; R4 represents an alkyl group, an aryl group, an alkylaryl group, a heteroaryl group, an arylalkyl group, an oxaalkyl group, an alkenyl group or an RFCH2— group; RF is a perfluoroalkyl group, a partially fluorinated alkyl group, or a partially or totally fluorinated phenyl group; each of the R′2 and R′3 groups represents R or F.
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Page/Page column 23
(2011/08/02)
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- Perfluoroparacyclophane and methods of synthesis and use thereof
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A composition comprising perfluoro-[2,2]-paracyclophane dimer compound is disclosed. The synthesis reaction of the paracyclophane dimer from 1,4-bis(chlorodifluoromethane)-2,3,5,6-tetrafluorobenzene involves heating in the presence of a metal catalyst and a solvent. A perfluorinated paraxylylene coating formed from the perfluorinated paracyclophane dimer is also disclosed.
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Page/Page column 3
(2008/12/08)
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- Synthesis of perfluoro[2.2]paracyclophane
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(Chemical Equation Presented) A synthesis of perfluoro[2.2]paracyclophane has been sought ever since the partially fluorinated octafluoro[2.2]- paracyclophane (AF4) was prepared and its chemistry studied. This compound has now been prepared in 39% yield from the precursor, 1,4-bis(chlorodifluoromethyl) -2,3,5,6-tetrafluorobenzene by its reaction with Zn when heated in acetonitrile at 100°C. Two preparations of the precursor, first from 1,4-dicyano-2,3,5,6- tetrachlorobenzene and an improved method beginning from 1,2,4,5- tetrachlorobenzene, are also described as are key comparisons to our related synthesis of AF4.
- Dolbier Jr., William R.,Xie, Puhui,Zhang, Lianhao,Xu, Wei,Chang, Ying,Abboud, Khalil A.
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p. 2469 - 2472
(2008/09/19)
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- An organic p-type dopant with high thermal stability for an organic semiconductor
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To overcome the thermal instability of a p-doped organic hole transporting layer using the state-of-the-art p-type dopant, 2,3,5,6-tetrafluoro-7,7,8,8- tetracyanoquinodimethane, a potent electron accepter, 3,6-difluoro-2,5,7,7,8,8- hexacyanoquinodimethane, has been found to possess superior thermal stability and proved to be an excellent p-type dopant. The Royal Society of Chemistry.
- Gao, Zhi Qiang,Mi, Bao Xiu,Xu, Gui Zhen,Wan, Yi Qian,Gong, Meng Lian,Cheah, Kok Wai,Chen, Chin H.
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p. 117 - 119
(2008/09/19)
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- A new route to 2,3,5,6-tetrafluoroterephthal aldehyde and its chemical transformation
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The title compound was prepared from commercial available and cheaper starting material terephthalolyl chloride by six-step reaction sequence in total 40% yield. Its chemical transformations were also studied.
- Zhu, Shizheng,Zhao, Jingwei,Cai, Xian
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p. 451 - 454
(2007/10/03)
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- Aromatic radical-anions. XII. A cyclic amperometric and ESR study of the transformations of polyfluorinated benzonitrile radical-anions
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Cyclic voltamperometry and ESR spectrometry were used to study the chemical transformations of radical-anions of benzonitrile derivatives containing from two to five fluorine atoms.Two types of transformations were found to be characteristic for such species, namely, the elimination of a fluoride anion and subsequent formation of defluorination products and dimerization with the subsequent formation of fluorinated derivatives of 4,4'-dicyanodiphenyl.The facility of these processes depends significantly on the number and arrangement of the fluorine atoms in the benzene ring.The relationship between the electronic structure and reactivity of fluorinated benzonitrile radical-anions was examined.
- Efremova, N. V.,Starichenko, V. F.,Shteingarts, V. D.
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- Entropy Changes and Electron Affinities from Gas-Phase Electron-Transfer Equilibria: A(-) + B = A + B(-)
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By measuring the electron-transfer equilibria 1, A(-) + B = A + B(-), at 150 deg C with a pulsed electron high-pressure mass spectrometer we determined the ΔGo1 values involving 12 new compounds.Measurements of the temperature dependence of K1 for 21 reactions involving some of the new compounds and many compounds whose ΔGo1 had been determined previously led, via van't Hoff plots, to ΔHo1 and ΔSo1 values.These were interconnecting such that ΔHo and ΔSo continuous scales (ladders) were obtained.These were anchored to SO2 whose electron affinity is accurately known.Available geometries and vibrational frequencies for SO2 and SO2(-) permit the evaluation of So(SO2(-)) - So(SO2).Through the ΔSo scale the So(B(-)) - So(B) for the other compounds B could be obtained also.Certain regularities in the So(B(-)) - So(B) data permitted entropy estimates to be made also for compounds for which no van't Hoff plots were made.In this manner a table of ΔHo, ΔSo, and ΔGo data for the electron capture e + B = B(-) was obtained, which contains some 50 compounds B.Most of the compounds are substituted benzenes, quinones, conjugated acid anhydrides, and perfluorinated organics.
- Chowdhury, Swapan,Heinis, Thomas,Grimsrud, Eric P.,Kebarle, Paul
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p. 2747 - 2752
(2007/10/02)
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