Transition-metal-catalyzed cross-coupling reactions between naturally abundant sp3-hybridized carbon centers facilitate access to diverse molecules with complex three-dimensional structures. Organometallic compounds are among one of the most powerful reagents that are broadly used in carbon–carbon bondformations. Although sp2-hybridized organometallic compounds are widely employed in cross-couplings, sp3-hybridized
Electrochemical Oxidation of 1-Phenylthio-1-trimethylsilylalkanes
作者:Jun-ichi Yoshida、Sachihiko Isoe
DOI:10.1246/cl.1987.631
日期:1987.4.5
Electrochemical oxidation of 1-phenylthio-1-trimethylsilylalkanes in the presence of alcohol resulted in facile cleavage of the carbon–silicon bond and formation of the corresponding acetals.
在醇存在下,1-苯硫基-1-三甲基硅基烷的电化学氧化导致碳-硅键的容易断裂,并形成相应的缩醛。
Highly effective tandem hydroformylation–acetalization of olefins using a long-life Brønsted acid–Rh bifunctional catalyst in ionic liquid–alcohol systems
作者:Xin Jin、Kun Zhao、Feifei Cui、Fangfang Kong、Qiangqiang Liu
DOI:10.1039/c3gc41231h
日期:——
A robust and highly effective tandem hydroformylationâacetalization of olefins using a Brønsted acidâRh bifunctional catalyst (ARBC) in ionic liquidâalcohol systems is reported. The key feature of the ARBC is its use of a zwitterionic phosphine ligand bearing an amino acid tag. This novel ARBC shows an excellent catalytic efficiency and a long service life without a significant drop in both the hydroformylation efficiency and the acetalization efficiency or Rh loss for more than seventeen cycles. We believe that the long-term high activity and acetal selectivity mainly benefit from the synergy between the acidic active site and the Rh active site on the ARBC and the highly effective immobilization and recycling of ARBC in ionic liquidâalcohol systems due to the strong affinity of ARBC for the ionic liquid.
Hydroformylation of terminal alkenes in alcohol solvents leads to the selective formation of the corresponding acetals. The Xantphos ligand gave the best results as well as acetal selectivities higher than 99% and linear/branched ratios of up to 52 were obtained. The scope of the reaction was studied. Acetals were found to be unreactive under hydroaminomethylation conditions.
Co-catalysis of a bi-functional ligand containing phosphine and Lewis acidic phosphonium for hydroformylation–acetalization of olefins
作者:Yong-Qi Li、Peng Wang、Huan Liu、Yong Lu、Xiao-Li Zhao、Ye Liu
DOI:10.1039/c5gc02127h
日期:——
L2 containing a phosphine and a Lewis acidic phosphonium exhibited synergetic catalysis and sequential catalysis for one-pot hydroformylation–acetalization.