Synthesis, structure and reactivity of Ga-substituted distibenes and Sb-analogues of bicyclo[1.1.0]butane

Monovalent gallanediyl LGa {L=HC[C(Me)N(2,6‐iPr2C6H3)]2} reacts with SbX3 to form the Ga‐substituted distibenes [(LGaX)2Sb2] (X=NMeEt 1, Cl 2). Upon heating, 2 reacts to the bicyclo[1.1.0]butane analogue [(LGaCl)2(μ,η1:1‐Sb4)] 3 containing a [Sb4]2− dianion. Moreover, 2 reacts with Li amides LiNR2 in salt elimination reactions that form the corresponding amido‐substituted compounds 1 and [(LGaNMe2)2Sb2] 4, whereas reactions of 4 and [(LGaNMe2)2(μ,η1:1‐Sb4)] 5 with two equivalents of GaCl3 resulted in the formation of 2 and 3, respectively. 1, 2 and 3 were characterized by 1H and 13C NMR spectroscopy, elemental analysis, and single crystal X‐ray diffraction. In addition, their bonding situation was analyzed by quantum chemical calculations.

Dedication to Prof. D. Naumann on the occasion of his 75th birthday.


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