Unsupported Nanoporous Gold Catalyst for Chemoselective Hydrogenation Reactions under Low Pressure: Effect of Residual Silver on the Reaction
作者:Balaram S. Takale、Xiujuan Feng、Ye Lu、Ming Bao、Tienan Jin、Taketoshi Minato、Yoshinori Yamamoto
DOI:10.1021/jacs.6b06569
日期:2016.8.17
observed for O2 oxidation. This marked contrast between H2 reduction and O2 oxidation is discussed. Further, Au>99Ag1NPore showed a high chemoselectivity toward reduction of terminal alkynes in the presence of internal alkynes which was not achieved using supported gold nanoparticle catalysts and other previously known methods. Reductive amination, which has great significance in synthesis of amines due
DITHIOL-FERROUS CHLORIDE CATALYZED SELECTIVE REDUCTION OF ALKYNES WITH SODIUM BOROHYDRIDE
作者:Masashi Kijima、Yoko Nambu、Takeshi Endo
DOI:10.1246/cl.1985.1851
日期:1985.12.5
Simple dithiols-ferrous chloride or lipoamide-ferrous chloride were found to be effective catalysts for the selective reduction of substituted alkynes to alkenes with sodiumborohydride presumably by forming active dithiol-Fe(II) complexes.
As regulations that restrict the use of organic solvents become more stringent, ball milling remains an attractive substitute for traditional organic synthesis. However, the mechanochemistry community does not have a purification pathway to complement the solvent-free, ball milling process. Functional resins have proven to be powerful synthetic tools that simplify purification, but traditional handling of these resins restricts their utility, as hazardous organic solvents are needed to swell the resin. Ball milling the functional resin exposes the functional groups as a function of surface area. This report details the use of ball milling and functional resins to perform an environmentally attractive version of the Wittig reaction.
Synthesis of Stilbenes Promoted by the Mixture of Zinc and Iron Powder
作者:Zhiying Zhang、Yuanyuan Xie、Xiaochun Yu
DOI:10.3184/030823409x401754
日期:2009.3
Stilbenes have been synthesised by a one-pot reaction of aldehydes with benzyl bromide. The reaction was promoted by both triphenylphosphine and the mixture of zinc and iron together in sealed tube. The yields ranged from moderate to excellent.
Regio- and Stereoselective Hydrosilylation of 1,3-Enynes Catalyzed by Palladium
作者:Hui Zhou、Christina Moberg
DOI:10.1021/ol4001334
日期:2013.4.5
In the presence of Pd(0) and a phosphine, hydrosilylation of 1,3-enynes with Me2SiHCl proceeds to yield dienylsilanes with the silicon function added to the internal alkyne carbon atom and with (E)-configuration of newly formed olefinic bond. The silanols isolated after hydrolysis of the primarily obtained products serve as precursors to conjugateddienes with different substitution patterns.