Palladium-catalysed oxidation of alcohols with carbon tetrachloride, formation of 4,4,4-trichloro ketones from allylic alcohols and carbon tetrachlorid
作者:Hideo nagashima、Koji Sato、Jiro Tsuii
DOI:10.1016/s0040-4020(01)91368-7
日期:1985.1
Pd salts catalyseoxidation of alcohols with CCl4 in the presence of K2CO3. Primary alcohols are oxidised to esters, and secondaryalcohols to ketones. CCl4 is converted to CHCl3. The reaction of allylicalcohols bearing a terminal olefinic bond with CCl4 or BrCCl3 in the presence of palladium catalyst at 110° affords 4,4,4-trichloro ketones. At 40°, simple adducts of CCl4 or BrCCl3 having a halohydrin
Facile one-pot synthesis of α-bromoketones from olefins using bromide/bromate couple as a nonhazardous brominating agent
作者:Rajendra D. Patil、Girdhar Joshi、Subbarayappa Adimurthy、Brindaban C. Ranu
DOI:10.1016/j.tetlet.2009.03.047
日期:2009.5
A new method for the preparation of α-bromoketones from olefins using bromide/bromate couple as a nonhazardous brominating agent has been developed. Several α-bromoketones were successfully prepared from a variety of olefins by this method. This procedure is an alternative to conventional molecular bromine.
Electrochemical bromofunctionalization of alkenes in a flow reactor
作者:Jakob Seitz、Thomas Wirth
DOI:10.1039/d1ob01302e
日期:——
of brominating reagents. The electrochemical oxidation of bromide to bromine is a viable strategy to reduce waste by avoiding chemical oxidants. Furthermore, the in situ generation of reactive intermediates minimizes the risk of hazardous reagents. In this work, we investigate the electrochemical generation of bromine from hydrobromic acid in a flow electrochemicalreactor. Various alkenes could be converted
The reaction of epoxides with lithiumhalides was efficiently promoted on the surface of silica gel in the absence of any solvent to give the corresponding β-halohydrins. The reactivity of lithiumhalides was shown to follow the order LiI> LiBr>> LiCl, and the reactivity of LiCl was dramatically increased by adding an equivalent amount of water to this system. On the other hand, a similar reaction