Enantioselective hydrogenation of furans and benzofurans remains a challenging task. We report the hydrogenation of 2‐ and 3‐substituted furans by using iridium catalysts that bear bicyclic pyridine–phosphinite ligands. Excellent enantioselectivities and high conversions were obtained for monosubstituted furans with a 3‐alkyl or 3‐aryl group. Furans substituted at the 2‐position and 2,4‐disubstitutedfurans proved
A convenient method for the preparation of 3-trimethylsilyl-2,5-dihydrofurans and their conversion to furans
作者:Fumie Sato、Hiroshi Kanbara、Youichi Tanaka
DOI:10.1016/s0040-4039(01)91120-7
日期:1984.1
or ketones affords (E)-3-trimethylsilyl-2-alken-1,4-diols (2), which can be readily dehydrated to 3-trimethylsilyl-2,5-dihydrofurans (3) by treatment with BF3OEt2. The compounds (3) are converted to furans (5) by epoxidation and subsequent treatment with H2SO4.
将3-三甲基甲硅烷基-2-丙炔-1-醇(1)进行氢磁化,然后与醛或酮反应,可制得(E)-3-三甲基甲硅烷基-2-链烯-1,4-二醇(2),该物质易于脱水通过用BF 3 OEt 2处理得到3-三甲基甲硅烷基-2,5-二氢呋喃(3)。通过环氧化和随后用H 2 SO 4处理将化合物(3)转化为呋喃(5)。
A Convenient Preparation of 3-Substituted Furans: Synthesis of Perillene and Dendrolasin
作者:D. K. Barma、Abhijit Kundu、Rachid Baati、Charles Mioskowski、J. R. Falck
DOI:10.1021/ol025708s
日期:2002.4.1
A variety of 3-substitutedfurans, including the natural products perillene and dendrolasin, are obtained in good yield via reductive annulation of 1,1,1-trichloroethyl propargyl ethers using catalytic Cr(II) regenerated by Mn/TMSCl. [reaction: see text]
Synthesis and Characterization of Regiorandom and Regioregular Poly(3-octylfuran)
作者:Jeffrey K. Politis、Joel C. Nemes、M. David Curtis*
DOI:10.1021/ja003588i
日期:2001.3.1
Poly(3-octylfuran) has been synthesized with three regioregularities: P3OF-95, P3OF-75, and P3OF-50, where the number signifies the percentage HT content. The 95% HT material is highly crystalline with a structure similar to that of HT-poly(3-octylthiophene), P3OT. The lamellar spacing is 22.1 A and the pi-stacking distance is 3.81 A. UV-vis spectroscopy reveals that P3OF-95 is aggregated in CHCl(3)
聚(3-辛基呋喃)已合成具有三种区域规则:P3OF-95、P3OF-75 和 P3OF-50,其中数字表示 HT 含量的百分比。95% HT 材料是高度结晶的,其结构类似于 HT-聚(3-辛基噻吩),P3OT。层状间距为 22.1 A,pi 堆叠距离为 3.81 A。紫外可见光谱显示 P3OF-95 在 CHCl(3) 溶液中聚集,P3OF-95 的固体薄膜,但不是 P3OF-75 或 -50 ,显示由于 pi 系统在堆叠形态中的相互作用,Davydov 和激子带分裂。Davydov 分裂的估计值为 0.15 eV (1200 cm(-1))。P3OF 相对于二茂铁/二茂铁在 0.32 V 下被可逆氧化,但将电位增加到 1.15 V 会导致不可逆氧化。P3OF 薄膜可以用碘蒸气进行 p 掺杂。掺杂的 P3OF-95 和 -75 薄膜的电导率分别为 10(-2) 和 10(-7) S/cm。碘掺杂薄膜的
INK FOR ELECTROWETTING DEVICE AND ELECTROWETTING DEVICE USING THE SAME
申请人:Sekisui Chemical Co., Ltd.
公开号:US20140347716A1
公开(公告)日:2014-11-27
The present invention relates to an ink for an electrowetting element comprising colorant particles and a solvent, wherein the colorant particles have a specific gravity of 2 or less and an average particle diameter of 20 to 300 nm, and wherein the content of the colorant particles in the ink is 5 to 50% by mass.