We present an allylic polyfluoroarylation reaction with broad substrate scope and excellent functional group tolerance, using organozinc reagents under mild conditions. A catalytic amount of triphenylphosphine oxide efficiently promotes iodine-zinc exchange reaction between polyfluoroaryl iodide and dimethylzinc, and the resulting phosphine oxide-activated polyfluoroarylzinc undergoes substitution reaction with allylic halides to afford the corresponding polyfluoroarylated products. (C) 2015 Elsevier Ltd. All rights reserved.
The structural landscape of heteroaryl-2-imidazoles: competing halogen- and hydrogen-bond interactions
作者:Christer B. Aakeröy、Tharanga K. Wijethunga、Mohammad Abul Haj、John Desper、Curtis Moore
DOI:10.1039/c4ce00803k
日期:——
fifteen different halogen-bond donors. 30 of the 75 experiments resulted in the formation of co-crystals, and fifteen of these produced crystals were suitable for single-crystal X-ray diffraction analysis. A systematic analysis of the primary intermolecular interactions in these fifteen structures shows that the halogen bond is formed with the best acceptor site (as predicted by DFT molecular electrostatic
Fluorocopolymer and process for preparing the same
申请人:NIPPON MEKTRON, LTD.
公开号:US20020028886A1
公开(公告)日:2002-03-07
Disclosed is a fluorocopolymer obtained by copolymerizing specific amounts of vinylidene fluoride, a perfluoro(lower alkyl vinyl ether), a specific fluorine compound represented by the following formula (I), a bromine-containing and/or iodine-containing vinyl monomer, and optionally, tetrafluoroethylene
1
This fluorocopolymer has a glass transition temperature of not higher than −25° C. Also disclosed is a crosslinking composition comprising the fluorocopolymer and a peroxide type crosslinking agent
Synthesis and Characterization of Fluorinated Heterofluorene-Containing Donor−Acceptor Systems
作者:Katharine Geramita、Yuefei Tao、Rachel A. Segalman、T. Don Tilley
DOI:10.1021/jo902488w
日期:2010.3.19
A series of oligothiopheiie-perfluoro-9-heterofluorene donor-acceptor (DA) compounds was synthesized via a combination of nucleophilic aromatic substitution (SNArF) and palladium coupling reactions. These compounds are of interest as possible building blocks for materials with useful electron transport properties, since they possess relatively low LUMO energy levels of -3.3 to -3.6 eV (as determined by differential Pulse voltammetry), The HOMO-LUMO energy gaps, as determined by UV-vis spectroscopy, range between 2.4 and 2.5 eV, and photoluminescence emission spectra reveal lambda(ems) values in the range of 480-600 nm (corresponding to yellow-orange emission). Dilute solution-state photolummescence quantum yields were significantly lower than those of the pure acceptor heterofluorenes (0.02-0.38 for the DA compounds vs similar to 1 for the pure acceptors), and notable solvatochromisin in the fluorescence suggests emission from a charge-separated state. Theoretical calculations show that HOMO-level electron density is more localized on the thiophene fragment, while the LUMO level electron density is mostly associated with the electron-deficient portion of the molecule. Photovoltaic (PV) devices based on DA/poly-3-hexylthiophene (P3HT) blends exhibit improved performance over P3HT-only devices, suggesting the ability of these DA compounds to transport electrons in the solid state.
Deacon, Glen B.; Smith, Richard N.M., Australian Journal of Chemistry, 1982, vol. 35, # 8, p. 1587 - 1597
作者:Deacon, Glen B.、Smith, Richard N.M.
DOI:——
日期:——
DEACON, G. B.;SMITH, R. N. M., AUSTRAL. J. CHEM., 1982, 35, N 8, 1587-1597