Dilithio sulfonyl methandiides are a synthetically and structurally highly interesting group of functionalized geminal dianions. Although very desirable, knowledge of the structure of dilithio methandiides in solution was lacking up to now. Herein, we describe the isolation and determination of the structure of tetrameric dilithio (trimethylsilyl)(phenylsulfonyl) methandiide in solution and in the crystal. The elucidation of the structure of the tetramer is based on crystal structure analysis and ¹³C/⁶Li NMR spectroscopic data. A characteristic feature of the structure of the tetramer is the C₂ symmetric C–Li chain, composed of four doubly Li-coordinated dianionic carbon and five Li atoms. Three Li atoms are devoid of a contact to a dianionic C atom. The tetramer, the dianionic C atoms of which undergo fast exchange, is in THF solution in fast equilibrium with a further aggregate, which is stable only at low temperatures.

中文翻译：

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基于晶体结构分析和6Li / 13C NMR光谱数据，确定溶液中四聚磺酰基二硫代二甲双胍的分离和结构测定。

二硫代磺酰二甲醚是合成和结构上非常有趣的一组功能化双键二价阴离子。尽管非常理想，但迄今为止尚缺乏关于溶液中二硫代二甲基乙二胺的结构的知识。在这里，我们描述了溶液和晶体中四聚二硫代（三甲基甲硅烷基）（苯磺酰基）乙二胺的结构的分离和测定。对四聚体结构的阐明是基于晶体结构分析和¹³ C / ⁶ Li NMR光谱数据。四聚体结构的特征是C ₂对称的C–Li链，由四个锂配位的双阴离子碳和五个Li原子组成。三个Li原子没有与阴离子C原子接触。四价单体（其双阴离子C原子经历快速交换）在THF溶液中与其他聚集体快速平衡，该聚集体仅在低温下稳定。