Practical Method for Transforming Alkynes into α-Diketones
摘要:
[GRAPHICS]Oxidation of alkynes to alpha-dicarbonyl derivatives through a convenient one-pot procedure via a Bronsted acid-promoted "hydration" and a DMSO-based oxidation sequence has been achieved in high yields. The scope and limitations of the reaction have also been investigated.
Highly efficient synthesis of 1,2-disubstituted acetylenes derivatives from the cross-coupling reactions of 1-bromoalkynes with organotitanium reagents
作者:Chuan Wu、Qing-Han Li
DOI:10.1016/j.tet.2021.132370
日期:2021.9
A Highly efficient route for the synthesis of 1,2-disubstituted acetylene derivatives has been developed by nickel catalyzed cross-couplings of alkynyl halides with aryl titanium reagents under mild conditions. This has given corresponding cross-coupling products good to excellent isolated yields of up to 92 %. The aryls bearing electron-donating or electron-withdrawing groups in either alkynylhalides
Direct <i>trans</i>-Selective Ruthenium-Catalyzed Reduction of Alkynes in Two-Chamber Reactors and Continuous Flow
作者:Karoline T. Neumann、Sebastian Klimczyk、Mia N. Burhardt、Benny Bang-Andersen、Troels Skrydstrup、Anders T. Lindhardt
DOI:10.1021/acscatal.6b01045
日期:2016.7.1
efficient trans-selective hydrogenation of alkynes under lowhydrogenpressure and lowreaction temperatures is reported, applying a commercially available ruthenium hydride complex. The developed reaction conditions, which tolerate a variety of functional groups, are carried out in a two-chamber setup with ex situ generated hydrogen. The reaction setup is highly suitable for deuterium labeling. The trans-selective
Hydrazone compounds, processes for their production, intermediates
申请人:Ishihara Sangyo Kaisha Ltd.
公开号:US05288727A1
公开(公告)日:1994-02-22
The present invention relates to a hydrazone compound of the formula (I) or its salt, a process for its preparation, an intermediate of the formula (II-5), a pesticidal composition containing said hydrazone compound or its salt as the active ingredient, and a pesticidal method of applying an effective amount thereof: ##STR1##
Hydrazone compounds, processes for their production, intermediates useful for their production and pesticidal compositions containing them
申请人:ISHIHARA SANGYO KAISHA, LTD.
公开号:EP0500111A2
公开(公告)日:1992-08-26
The present invention relates to a hydrazone compound of the formula (I) or its salt, a process for its preparation, an intermediate of the formula (11-5), a pesticidal composition containing said hydrazone compound or its salt as the active ingredient, and a pesticidal method of applying an effective amount thereof:
Nickel-catalyzed tandem conversion of paraformaldehyde : methanol to hydrogen and formate/chemo- and stereoselective hydrogenation of alkynes under neutral conditions
development of new catalytic protocols for clean and COx-free hydrogen generation from fundamental feedstocks is always interesting and challenging. Herein, we disclose nickel-catalyzed dihydrogen generation from a mixture of paraformaldehyde–methanol under base-free and activator-free conditions. The dihydrogen generation from this redox combination under neutral, oxidativecoupling conditions has been