An efficient method for chlorination of alcohols using PPh3/Cl3CCONH2
作者:Wanchai Pluempanupat、Warinthorn Chavasiri
DOI:10.1016/j.tetlet.2006.07.060
日期:2006.9
A new and convenient method for the chlorination of alcohols utilizing PPh3/Cl3CCONH2 is addressed. Various alcohols could smoothly be converted into their corresponding alkyl chlorides in high yield under mild conditions with short reaction times. A mechanism is disclosed with the evidence of inversion of configuration of the analogous alkyl chloride derived from R-(−)-2-octanol.
Stereoretentive Chlorination of Cyclic Alcohols Catalyzed by Titanium(IV) Tetrachloride: Evidence for a Front Side Attack Mechanism
作者:Deboprosad Mondal、Song Ye Li、Luca Bellucci、Teodoro Laino、Andrea Tafi、Salvatore Guccione、Salvatore D. Lepore
DOI:10.1021/jo3023439
日期:2013.3.1
A mild chlorination reaction of alcohols was developed using the classical thionyl chloride reagent but with added catalytic titanium(IV) chloride. These reactions proceeded rapidly to afford chlorination products in excellent yields and with preference for retention of configuration. Stereoselectivities were high for a variety of chiral cyclic secondary substrates including sterically hindered systems
The reactions of various substrates including aliphatic hydrocarbons, aromatic compounds, and olefins were investigated in subcritical carbontetrachloride. Ketones and sulfones were stable under the employed conditions. The coupling adducts between olefins and carbontetrachloride were obtained from the reactions of olefins.
aliphatic hydrocarbons and the side chains of aromatichydrocarbons were chlorinated in subcritical carbontetrachloride. Chlorination of aromatic compounds including 1,4-disubstituted benzenes was investigated. Ketones and sulfones were stable under the employed conditions. Sulfoxides were converted into sulfides in a low to modest yields. The coupling adducts between olefins and carbontetrachloride were