Neutral and Cationic N‐Heterocyclic Carbene Zinc Adducts and the BnOH/Zn(C
<sub>6</sub>
F
<sub>5</sub>
)
<sub>2</sub>
Binary Mixture – Characterization and Use in the Ring‐Opening Polymerization of β‐Butyrolactone, Lactide, and Trimethylene Carbonate
作者:Gilles Schnee、Christophe Fliedel、Teresa Avilés、Samuel Dagorne
DOI:10.1002/ejic.201300292
日期:2013.7.12
molecular structures of derivatives 2b, 4b, and 4c confirmed their adduct nature, and their bonding and geometrical parameters are influenced by the nature of the Zn–X group. The ionization reaction of the dimethyl Zn species 2a and 2b with the methide abstracting reagent B(C6F5)3 in the presence of tetrahydrofuran (THF) afforded the NHC–Zn organocations (1,3-dimesitylimidazol-2-ylidene)Zn(Me)(THF)2+ (3a+)
各种 N-杂环卡宾 (NHC) 锌加合物 NHC-ZnMe2 [2a, NHC = 1,3-dimesitylimidazol-2-ylidene; 2b,NHC = 1,3-(2,6-iPr2Ph)2-咪唑-2-亚基;2c, NHC = 1,3-二叔丁基咪唑-2-ylidene] 和 NHC-Zn(C6F5)2 [4a, NHC = 1,3-dimesitylimidazol-2-ylidene; 4b,NHC = 1,3-(2,6-iPr2Ph)2-咪唑-2-亚基;4c,NHC = 1,3-二-叔丁基咪唑-2-亚基] 通过适当的 NHC 配体与 ZnMe 2 或(甲苯)Zn(C 6 F 5 ) 2 的反应合成。衍生物 2b、4b 和 4c 的 X 射线分子结构证实了它们的加合物性质,它们的键合和几何参数受 Zn-X 基团性质的影响。在四氢呋喃 (THF) 存在下,二甲基 Zn 物质 2a