Various kinds of diphenylphosphinodithioates were prepared and allowed to react with someorganolithium compounds under mild reaction conditions to give functionalized unsymmetrical sulfides and disulfides in good yields.
Formation of cyclic sulfonium salts by Me3SiI-promoted intramolecular displacement of hydroxide or methoxide by sulfide. Ring contraction thiepane → thiolane
作者:Vanda Cere`、Salvatore Pollicino、Antonino Fava
DOI:10.1016/0040-4020(96)00229-3
日期:1996.4
methyl ethers). The outcome may be a cyclic sulfonium salt or an iodide arising from cleavage of a sulfonium intermediate. Cyclization is especially favored with secondary and tertiary alcohols or ethers, and with an aliphatic more than an aromatic sulfide function. A transannular version of the reaction results in the facile ringcontraction of a 7- to a 5-membered cyclic sulfide.