Preparation of the Alkyl Complex Ta(NSiMe<sub>3</sub>)[N(SiMe<sub>3</sub>)<sub>2</sub>](CH<sub>2</sub>Bu<sup>t</sup>)<sub>2</sub>. Preferential Oxygen Insertion in Its Reaction with O<sub>2</sub> and a Ligand Exchange in the Alkoxide Ta(NSiMe<sub>3</sub>)[N(SiMe<sub>3</sub>)<sub>2</sub>](OCH<sub>
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资源简介：
The alkyl amide imide complex Ta(NSiMe3)[N(SiMe3)2](CH2But)2 (2) has been prepared from the reaction of {Ta(μ-Cl)Cl(NSiMe3)[N(SiMe3)2]}2 (1) with LiCH2But. Reaction of 2 with O2 leads to the preferential insertion of oxygen
into the two Ta−alkyl bonds, yielding an alkoxy complex, Ta(NSiMe3)[N(SiMe3)2](OCH2But)2 (3). 3 undergoes a ligand
exchange to give Ta2(μ-NSiMe3)2(OCH2But)6 (4) and
Ta(NSiMe3)[N(SiMe3)2]2(OCH2But) (5). The exchange
reaches an equilibrium: 2 3 ⇌ 1/2 4 + 5; Keq = 2.10(11) ×
10−4 at 296 K; ΔG°296K = 4.98(3) kcal. 3 and 5 have
also been prepared from the reactions of 1 with LiOCH2But, and LiN(SiMe3)2 and
LiOCH2But, respectively. 2 and 4 have been characterized by single-crystal X-ray diffraction.
创建时间：
2010-11-08
