synthetic way leading to 1,4-benzodithians (2) variously substituted at the benzenoid ring. The ready availability of these latter makes the 1,4-benzodithian system itself being regarded as appealing intermediate to obtain, after sulfur replacement or removal, aromatic compounds that cannot be prepared under the usual electrophilicsubstitution conditions.
Chemistry of ethanediyl S,S-acetals 6- An example of vicarious nucleophilic substitution of hydrogen in 1,4-benzodithians
作者:Romualdo Caputo、Mauro De Nisco、Giovanni Palumbo、Carlo Adamo、Vincenzo Barone
DOI:10.1016/s0040-4020(01)81819-6
日期:1993.1
1,4-Benzodithians, when treated with bromine in anhydrous chloroform, undergo very fast monobromination at the aromatic ring. By the use of quantum mechanical semiempirical calculations, the reaction is shown to proceed most likely via a vicarious nucleophilic substitution of hydrogen.