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Decameric and Dodecameric Sodium Amides and an Organosodium Amide with Stack Structures: [Na10 (NMe2)10(tmeda)4],|Na12(NMe2)12(tmeda)4|, and [Na12(NMe2)10(CH2C6H4Me)2(tmeda)4]

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Synthesis and Structure of [{Na(tmeda)}3][LiPh4], an Organometallic Complex Containing Two Different Alkali Metals

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