Formation of the Imide [Ta(NMe<sub>2</sub>)<sub>3</sub>(μ-NSiMe<sub>3</sub>)]<sub>2</sub> through an Unprecedented α-SiMe<sub>3</sub> Abstraction by an Amide Ligand
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Ta(NMe2)4[N(SiMe3)2] (1) undergoes the elimination of Me3Si-NMe2 (2), converting the −N(SiMe3)2 ligand to the NSiMe3 ligand, to give the imide “Ta(NMe2)3(NSiMe3)” (3) observed as its dimer 4. CyNCNCy captures 3 to yield guanidinates Ta(NMe2)3–n(NSiMe3)[CyNC(NMe2)NCy]n [n = 1 (5), 2 (6)]. The kinetic study of α-SiMe3 abstraction in 1 gives ΔH⧧ = 21.3(1.0) kcal/mol and ΔS⧧ = −17(2) eu.
创建时间：
2012-01-02
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