This dissertation consists of two parts.In the first part, we summarize the synthesis of selenol esters and the advance in the applications of Selenol esters as important reagents and intermediates in organic synthesis. Selenol esters have been employed as precursors of acyl radicals for several kinds of intermolecular and intramolecular free radical reactions. The mechanism of these typical free radical reactions are introduced and discussed.In the second part, we report a convenient synthesis of diacyl di...