Abstract

The reaction of lithium β-diketiminate [{2,6-Me₂C₆H₃N=CMe}₂CH]Li with benzophenone in toluene at 25°C affords the coordination complex [{2,6-Me₂C₆H₃N=CMe}₂CH]Li(Ph₂C=O) (I). New keto-β-diketimine {2,6-Me₂C₆H₃N=C(Me)}₂CHC(tert-Bu)=O (II) is synthesized by the reaction of tert-Bu(C=O)Cl with [{2,6-Me₂C₆H₃N=CMe}₂CH]Li. The metallation of keto-β-diketimine II with n-butyllithium in THF at 0°C gives lithium keto-β-diketiminate {[{2,6-Me₂C₆H₃N=C(Me)}₂CС(tert-Bu)=O]Li(THF)}_n (III). The exchange reaction of YCl₃ with compound III (molar ratio 1 : 2, THF) affords the yttrium bis(keto-diketiminate) complex [{2,6-Me₂C₆H₃N=C(Me)}₂CС(tert-Bu)=O]₂Y(μ²-Cl)₂L-(THF)₂ (IV). The molecular structures of complexes I, III, and IV are determined by X-ray diffraction analysis (CIF files CCDC nos. 2001131 (I), 2001132 (III), and 2001133 (IV)). Complex IV in the crystalline state exists as an ate complex with one LiCl molecule. Complexes I, III, and IV are catalysts of ring-opening polymerization of ε-caprolactone in toluene at 25°С.

中文翻译：

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钇和酮基β-二酮基锂复合物[{2,6-Me 2 C 6 H 3 N = C（Me）} 2CС（ter -Bu）= O] 2 Y（μ2 -Cl）2 Li（THF） ）2和{[{{2,6-Me 2 C 6 H 3 N = C（Me）} 2CС（ter -Bu）= O] Li（THF）} n。ε-己内酯聚合反应的合成，分子结构和催化活性

摘要

β-二酮化锂[{2,6-Me ₂ C ₆ H ₃ N = CMe} ₂ CH] Li与二苯甲酮在甲苯中于25°C反应，得到配位络合物[{2,6-Me ₂ C ₆ H ₃ N ＝ CMe} ₂ CH] Li（Ph ₂ C ＝ O）（I）。通过叔-Bu（C = O）反应合成了新的酮-β-二酮亚胺{2,6-Me ₂ C ₆ H ₃ N = C（Me）} ₂ CHC（叔-Bu）= O（II）。具有[{2,6-Me ₂ C ₆ H ₃ N = CMe} _2的ClCH] Li。酮-β-二酮亚胺的金属化II与Ñ在THF丁基锂在0℃下使锂酮-β-二亚胺基{[{2,6--ME ₂ ç ₆ ħ ₃ N = C（Me）的} ₂ CС（叔-Bu）＝ O] Li（THF）_n（III）。YCL的交换反应₃与化合物III（摩尔比1：2，THF），得到钇双（酮-二亚胺基）络合物[{2,6--ME ₂ ç ₆ ħ ₃ N = C（Me）的} ₂ CС（叔-Bu）= O] ₂ Y（μ ² -Cl）₂ L-（THF）₂（IV）。配合物I，III和IV的分子结构通过X射线衍射分析确定（CIF文件CCDC号2001131（I），2001132（III）和2001133（IV））。复杂的IV在结晶状态存在作为吃复合物与一个分子的LiCl。配合物Ⅰ，Ⅲ和Ⅳ是ε-己内酯在25℃下在甲苯中开环聚合的催化剂。