coupling reaction of aromatic and aliphatic ketones including acyclic aliphatic ketones proceeded smoothly to give the corresponding pinacols in good to high yields below room temperature by the combined use of titanium(II) chloride and zinc in the presence of pivalonitrile. Meso-selective formation of the coupling products was observed in the cases with some acyclic aliphatic ketones.
Aldehydes and ketones, on treatment with a low-valent cerium reagent, undergo reductive dimerization to produce the corresponding pinacols in high yield.
醛和酮经低价铈试剂处理后,进行还原二聚化,从而以高收率生产相应的频哪醇。
A Convenient Electrochemical Method for Conversion of 4-Haloacetophenone to 1-(4-Halophenyl)ethanol
作者:Yoshikazu Ikeda
DOI:10.1246/cl.1990.1719
日期:1990.9
In the presence of a catalytic amount of Sb(III), 4-fluoro-, 4-chloro-, 4-bromo-, and 4-iodoacetophenone were converted into the corresponding 1-(4-halophenyl)ethanols by an electrochemical method (−3.7 mA/cm2, 6F/mol, Pb cathode). Each alcohol yielded 91, 94, 98, and 94%, respectively.
Highly regioselective and chemoselective titanocene mediated Barbier-type allylation reactions
作者:Sara P. Morcillo、Ángela Martínez-Peragón、Verena Jakoby、Antonio J. Mota、Christian Kube、José Justicia、Juan M. Cuerva、Andreas Gansäuer
DOI:10.1039/c3cc49230c
日期:——
carboxylate 1 is an excellent chemoselective reagent for unprecedented alpha-regioselective Barbier-type reactions. It constitutes the first titanocene(III) able to tolerate epoxides and readily reduced carbonyl compounds, such as aromatic and alpha,beta-unsaturated aldehydes.
Zn-AlCl<sub>3</sub> · 6H<sub>2</sub>O-Mediated Reaction in Aqueous Media: Pinacol Coupling Reaction
作者:Binod Kumar Hazarika、Dilip Kumar Dutta
DOI:10.1080/00397911003797833
日期:2011.3.3
Abstract Vicinal diols have been prepared in good yield by pinacolcoupling reaction of aromatic aldehydes and ketones with commercially available zinc and AlCl3 · 6H2O in water.