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Synthesis of the First Isolable Geminal 1,1-Dilithiostannane and Its Intriguing Structural Diversity
Roman Bashkurov1, Natalia Fridman1, Dmitry Bravo-Zhivotovskii1
1Schulich Faculty of Chemistry, Technion-Israel Institute of Technology, Haifa, 32000, Israel.
Abstract:
The synthesis of the first isolable geminal 1,1-dilithiostannane is reported. In the solid state, the novel 1,1-dilithiostannane has three different structural motifs, depending on the reaction conditions used for its synthesis: (1) an unsolvated co-aggregate consisting of two 1,1-dilithiostannane molecules and two silyllithium molecules, {[(tBu2MeSi)2SnLi2]2 ⋅ [tBu2MeSiLi]2}; (2) a solvated trimeric stannyllithium dianion {[(tBu2MeSi)2Sn]3Li4}2- associated with two fully dissociated THF-solvated Li+ cations; (3) a THF-solvated contact-ion pair dimer of 1,1-dilithiostannane, [(tBu2MeSi)2SnLi2]2 ⋅ (THF)4.
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