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Efficient regioselective syntheses of trichloro-(2-chloroalkyl)-λ-tellanes, trichloro-(2-alkoxyalkyl)-λ-tellanes, bis-(2-alkoxyalkyl)ditellanes and dichlorobis-(2-chloroalkyl)-λ-tellanes in quantitative yields were developed based on tellurium tetrachloride and 1-alkenes (1-hexene and 1-heptene). Favorable conditions for selective preparation of both monoand bis-adducts of tellurium tetrachloride with 1-alkenes were established. Methoxytelluration was accomplished by the reaction of tellurium tetrachloride with 1-alkenes in CH2Cl2/MeOH at room temperature. Ethoxytelluration was carried out in CH2Cl2/EtOH at reflux. Trichloro-(2alkoxyalkyl)-λ-tellanes were also obtained by nucleophilic substitution of chlorine atom in trichloro-(2chloroalkyl)-λ-tellanes with alcohols under unusually mild conditions. TeCl4 + R Cl Cl3Te R R = C4H9, C5H11; Alk = Me, Et; Red = Na2S2O5/H2O/C6H6, NaBH4/H2O/THF TeCl4 + R OAlk Cl3Te R

Highly efficient regioselective synthesis of organotellurium compounds based on the reactions of tellurium tetrachloride with 1-alkenes