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The tetraorganodistibanes Pr 4 Sb 2  and Ph 4 Sb 2  were prepared by dehalogenation of the corresponding dioganoantimony bromides with magnesium in tetrahydrofuran. Mass spectra show that the distibanes Me 4 Sb 2 , Et 4 Sb 2  and i-Pr 4 Sb 2  react with air to yield the compounds of the formula R 4 Sb 2 O (R = Me, Et, i-Pr), which are assumed to be bis- (diorganoantimony)oxides. The species (Me 2 Sb) 2 O is also formed by hydrolysis of Me 2 SbBr. Ir and  1 H NMR data of this oxide confirm the proposed structure. The distibanes R 4 Sb 2  (R = Me, Et, Pr, Ph) react quantitatively with sulfur to yield the corresponding bis- (diorganoantimony)sulfides (R 2 Sb) 2 , as derived from ms, NMR and IH data. Ms data of the distibanes R 4 Sb 2  (R = Me, Et, i-Pr, Bu, Ph) are reported and discussed.

zeitschrift für naturforschung b

Synthese von Tetraorganodistibanen und oxidative Spaltung zu Bis(diorganoantimon)oxiden und -Sulfiden/ Synthesis of Tetraorganodistibanes and Oxidative Cleavage to Bis(diorganoantimony) Oxides and Sulfides