Structural Investigation of New Lithium Amidinates and Guanidinates |
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| Authors: | Phil Liebing Nicole Harmgarth Volker Lorenz Florian Zrner Liane Hilfert Sabine Busse Frank T Edelmann |
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| Institution: | Phil Liebing,Nicole Harmgarth,Volker Lorenz,Florian Zörner,Liane Hilfert,Sabine Busse,Frank T. Edelmann |
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| Abstract: | A series of potentially useful lithium amidinates and guanidinates were prepared and fully characterized. Treatment of N,N′‐diisopropylcarbodiimide with phenyllithium in diethyl ether afforded the lithium amidinate PhC(NiPr)2Li(OEt2)]2 ( 1 ). Similar treatment of N,N′‐diorganocarbodiimides R′–N=C=N–R′ R′ = iPr, cyclohexyl (Cy)] with secondary lithium amides LiNR2 R2 = Et2, iPr2, (CH2)4] followed by crystallization from THF or 1,4‐dioxane gave the lithium guanidinates R2NC(NR′)2Li(S)]2 2 : R = Et, R′ = iPr, S = THF; 3 : R2 = (CH2)4, R′ = iPr, S = THF; 4 : R = R′ = iPr, S = ½ 1,4‐dioxane; 5 : R2 = (CH2)4, R′ = Cy, S = 1,4‐dioxane] as crystalline solids. Reaction of N‐lithioaziridine with the corresponding carbodiimides afforded solvent‐deficient {C2H4NC(NiPr2)2}2Li2(THF)]2 ( 6 ), and C2H4NC(NEt)(NtBu)Li(THF)]2 ( 7 ). Crystal structure determination revealed the presence of common ladder‐type dimeric structures for 1 – 5 . Compound 6 exists as a dimer of two ladder‐type dimers in the crystal, and 7 exhibits an unusual dimeric structure comprising an eight‐membered C2N4Li2 ring. |
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| Keywords: | Amidinate Lithium Guanidinate Solvate Crystal structure |
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