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Cyclic disilylated and digermylated germylenes

机译:环二甲苯基和二麦芽酰亚甲基

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摘要

The preparation of triethylphosphine adducts of cyclic disilylated or digermylated germylenes was achieved by reaction of 1,4-dipotassio-1,1,4,4- tetrakis(trimethylsilyl)tetramethyltetrasilane with GeBr_2· (dioxane) and PEt_3. Phosphine abstraction with B(C_6F_5)_3 allowed formation of the base-free germylenes, which undergo 1,2-trimethylsilyl shifts to the germylene atom to form the respective silagermene or digermene, which further dimerize in [2 + 2] cycloadditions to tricyclic compounds. The reasons responsible for the germylenes' completely different reactivities in comparison to the previously studied analogous stannylenes and plumbylenes were elucidated in a theoretical study.
机译:环状二甲硅烷基化或二甲基甲硅烷基化的亚甲基三苯膦的三乙基膦加合物的制备是通过1,4-二potassio-1,1,4,4-四(三甲基甲硅烷基)四甲基四硅烷与GeBr_2·(二恶烷)和PEt_3反应而实现的。用B(C_6F_5)_3进行膦萃取可以形成无碱基的亚甲基,这些亚甲基经过1,2-三甲基甲硅烷基转移到亚甲基原子上,形成各自的硅根草烯或二锗烯,它们在[2 + 2]环加成物中进一步二聚成三环化合物。在理论研究中阐明了与先前研究的类似亚苯乙烯基和亚苄基相比,亚甲基苯的反应性完全不同的原因。

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