Dibismuthine bisadduct

Syntheses and Solid State Structures of Group 13-Distibine and -Dibismuthine Bisadducts... 

Scheme 5. Synthesis of tetraalkyldistibine and-dibismuthine bisadducts [R3M2][E2R4]...

The so-prepared compounds are stable in the pure form, whereas they easily undergo consecutive reactions in solution under cleavage of the E—E bond (see Sect. 3.1). Four tetraalkyldistibine (32-35) and two -dibismuthine bisadducts (36 and 37) have been structurally characterized (Table 8). 

Reactions of tetraalkyldistibines and -dibismuthines with trialkylalanes and -gallanes yield bisadducts of the type [R3M]2[E2R4]. These compounds are stable in the solid state, while they easily undergo consecutive reactions in solution. Completely alkyl-substituted heterocycles [R2MER x are formed under cleavage of the Sb—Sb bond, as was demonstrated for two Ga—Sb heterocycles. 

In sharp contrast to the intensely studied reactions of dipenteles with transition metal compounds, reactions with group 13 metal compounds are almost unknown. Only two diphosphine-borane bisadducts of Type C ([H3B]2[Me4P2], [H2(Br)B]2[Me4P2]) have been synthesized and structurally characterized65 but no diarsine, distibine or dibismuthine adducts. We, therefore, became interested in the synthesis of such compounds, focusing... 

---