Mild and Phosphine-Free Iron-Catalyzed Cross-Coupling of Nonactivated Secondary Alkyl Halides with Alkynyl Grignard Reagents
作者:Chi Wai Cheung、Peng Ren、Xile Hu
DOI:10.1021/ol501087m
日期:2014.5.2
cross-coupling of nonactivated secondary alkylbromides and iodides with alkynyl Grignardreagents at room temperature has been developed. A wide range of secondary alkyl halides and terminal alkynes are tolerated to afford the substituted alkynes in good yields. A slight modification of the reaction protocol also allows for cross-coupling with a variety of primary alkyl halides.
Nickel-Catalyzed Sonogashira Reactions of Non-activated Secondary Alkyl Bromides and Iodides
作者:Jun Yi、Xi Lu、Yan-Yan Sun、Bin Xiao、Lei Liu
DOI:10.1002/anie.201307069
日期:2013.11.18
A nicked reaction: The title reaction of terminal alkynes with non‐activated secondaryalkyliodides and bromides was accomplished for the first time. This reaction provides a new and practical approach for the synthesis of substituted alkynes (see scheme; cod=cyclo‐1,5‐octadiene).
<i>Z</i>-Selective Olefin Synthesis via Iron-Catalyzed Reductive Coupling of Alkyl Halides with Terminal Arylalkynes
作者:Chi Wai Cheung、Fedor E. Zhurkin、Xile Hu
DOI:10.1021/jacs.5b01784
日期:2015.4.22
Selective catalytic synthesis of Z-olefins has been challenging. Here we describe a method to produce 1,2-disubstituted olefins in high Z selectivity via reductive cross-coupling of alkylhalides with terminal arylalkynes. The method employs inexpensive and nontoxic catalyst (iron(II) bromide) and reductant (zinc). The substrate scope encompasses primary, secondary, and tertiaryalkylhalides, and
POLYMERIZABLE LIQUID CRYSTAL COMPOUND, COMPOSITION FOR OPTICAL FILM, AND OPTICAL FILM, COMPENSATION FILM, ANTIREFLECTIVE FILM, AND DISPLAY DEVICE INCLUDING THE SAME
申请人:SAMSUNG ELECTRONICS CO., LTD.
公开号:US20170183286A1
公开(公告)日:2017-06-29
A polymerizable liquid crystal compound represented by Chemical Formula 1:
wherein in Chemical Formula 1, groups and variables are the same as defined in the detailed description.
Highly Diastereoselective C(sp3)C(sp) Cross-Coupling Reactions between 1,3- and 1,4-Substituted Cyclohexylzinc Reagents and Bromoalkynes through Remote Stereocontrol
Under the influence: The use of the readily available and inexpensive orthophenantroline derivative neocuproine as a ligand in the generally applicable and highly stereoselective palladium‐catalyzed title reaction results in diastereomeric ratios of up to 98:2. The method can be used for the synthesis of building blocks which may be relevant for the synthesis of liquid crystalline mesogens and their