New Organotellurium Compounds Cyclized from Phthalic Anhydride Derivatives

Abstract

New heterocyclic tellurium(IV) compounds of the general formula C₁₀H₈O₃Te(R)(X), where R = X = Cl^–, Br^–, I^– or R = methyl, ethyl, allyl; X = Br^–, I ^–, have been prepared starting from 2,3-dimethyl-1,3-butadiene and maleic anhydride via conversion into several intermediates to give the cyclic tellurium(IV) compounds as final products. These compounds have been characterized on the basis of their physical properties. The IR spectral data for these compounds showed a characteristic absorption band, attributable to Te—C bonds. The ¹H NMR spectra recorded in DMSO-d₆ showed considerable stability towards reductive-elimination reactions and do not interact with solvent used. The molar conductivities measured in DMSO or DMF indicate that these compounds are weak electrolytes and there is some ion pairing.