Cleavage of Tellurium-Carbon Bonds of Heavalentg Organotellurium Compounds by Potassium Graphite

摘要

Recently, we reported on the synthesis of the hexaaryltel- lurium compounds Ar6 Te (1: Ar = 4-CF_3C_6H_4) and Ph_6 Te,the first neutral hexaarylated compounds) These hexaaryl compounds are stable to atmospheric moisture and are inert to nucleophiles such as alkyllithium reagents. Here we report that one of the Te-C bonds of 1 is readily cleaved by potassium graphite (KC_8) to afford Ar5Te-K+Cg (2.K+Cg) (Scheme 1). The reaction of 2. K+Cg with CH_3 I gave quanti- tatively Ar5 TeCH_3 , which could not be obtained from Ar_5Te-Li+.