Ring expansion reactions of 1,3-dithiolans and 1,3-dithians. A new synthesis of dihydro-1,4-dithiins and dihydro-1,4-dithiepins
作者:Cosme G. Francisco、Raimundo Freire、Rosendo Hernández、José A. Salazar、Ernesto Suárez
DOI:10.1016/s0040-4039(01)90027-9
日期:1984.1
A mild and convenient method for ringexpansion of 1,3-dithiolans and 1,3-dithians to dihydro-1,4-dithiins and dihydro-1,4-dithiepins, respectively, using phenyl selenenyl chloride in methylene chloride is described. A mechanism involving sulphenyl chloride derivatives as intermediates is proposed.
A variety of aldehydes and aliphatic ketones were converted into the corresponding dithioacetals at room temperature in good yields by using small amounts of telluriumtetrachloride as a mild Lewis acid catalyst.