A novel copper (i) mediated, symmetrical coupling procedure for alkyl, aryl, benzyl, and thiophenyl dihalides
作者:David K. Johnson、Jeffrey P Ciavarri、Faoud T Ishmael、Kurl J. Schillinger、Thomas A.P. van Geel、Stephen M. Stratton
DOI:10.1016/0040-4039(95)01850-h
日期:1995.11
were obtained with Li2CuCl3 and the following trends in halide reactivity were observed Br > Cl for alkyl, aryl, and thiophenyl dihalides. and benzyl halide > phenyl halide. Utilizing these trends, a symmetrical coupling procedure for alkyl. aryl benzyl and thiophenyl dihalides, simply carried out by combining the dihalide with metallic magnesium and Li2CuCl4 is reported
and cyclohexane) and the relative rate of O—H insertion into methanol to stereospecific cyclopropanation of the olefin to C—H insertion into cyclohexane are calculated from the ratios of products and substrates. It is found (i) that the reactivities of the substrates decrease in the order of methanol, olefin and cyclohexane and (ii) that electron-donating substituents generally lead to reaction with
Stilbene derivative, light emitting element material, light emitting element, light emitting device and electronic appliance
申请人:Egawa Masakazu
公开号:US20070100180A1
公开(公告)日:2007-05-03
An object of the present invention to provide a novel stilbene derivative having a large energy gap. In addition, it is another object of the present invention to provide a novel light emitting element material having a large energy gap which is suitable for a host material in a light emitting layer. Further in addition, it is another object of the present invention to provide a novel light emitting element material having a large energy gap and an electron transporting property. The present invention provides a stilbene derivative represented by a following general formula (3) and a light emitting element material including the stilbene derivative represented thereby:
wherein, n is an integer of 0 or more and 2 or less and m is an integer of 1 or more and 2 or less.
Synthesis and Structural Aspects of Silicon-bridged [2.2]Metacyclophanes
作者:Kozaburo Nishiyama、Tsunetoshi Sugawara
DOI:10.1246/cl.1992.1409
日期:1992.8
The title compounds were synthesized and the structural aspects were examined by NMR spectroscopy.
合成标题化合物并通过NMR光谱检查结构方面。
Synthesis of <i>trans</i>-stilbenes <i>via</i> phosphine-catalyzed coupling reactions of benzylic halides
作者:Sheng Zhang、Zhilong Xie、Zhanqiang Ye、Mingyang Zhang、Dongdeng Li、Masahiko Yamaguchi、Ming Bao
DOI:10.1039/d2ob01237e
日期:——
are also generated from the reactions of benzyl chlorides with phosphoniumsalts. Several P-based key intermediates have been detected by NMR and HRMS analyses, which shed light on the postulated catalytic cycle. In the presence of different bases, the transformations involve two different pathways, in which phenylcarbene and phosphonium alkoxide are considered as key intermediates, respectively. The
描述了一种高效实用的膦催化氯化苄的均偶联反应。在 CsF/B(OMe) 3和 NaH 作为碱的存在下,反应顺利进行,分别提供反式-二苯乙烯产量高,范围广。苄基氯与鏻盐的反应也产生不对称二苯乙烯。通过 NMR 和 HRMS 分析检测到几种 P 基关键中间体,这揭示了假定的催化循环。在不同碱基存在下,转化涉及两种不同的途径,其中苯卡宾和醇鏻分别被认为是关键中间体。这两种途径在合成上互补,但在机制上不同。合成效用,包括克级反应和直接获得 π 共轭分子,也已得到证明。