1,3-Bis(tricyanoborane)imidazoline-2-ylidenate Anion—A Ditopic Dianionic N-Heterocyclic Carbene Ligand,Angewandte Chemie International Edition

当前位置： X-MOL 学术 › Angew. Chem. Int. Ed. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

1,3-Bis(tricyanoborane)imidazoline-2-ylidenate Anion—A Ditopic Dianionic N-Heterocyclic Carbene Ligand
Angewandte Chemie International Edition ( IF 16.1 ) Pub Date : 2021-05-07 , DOI: 10.1002/anie.202105529
Ludwig Zapf ₁ , Udo Radius ₁ , Maik Finze ₁

Affiliation

The 1,3-bis(tricyanoborane)imidazolate anion 1 was obtained in high yield from lithium imidazolate and B(CN)₃−pyridine adduct. Anion 1 is chemically very robust and thus allowed the isolation of the corresponding H₅O₂⁺ salt. Furthermore, monoanion 1 served as starting species for the novel dianionic N-heterocyclic carbene (NHC), 1,3-bis(tricyanoborane)imidazoline-2-ylidenate anion 3 that acts as ditopic ligand via the carbene center and the cyano groups at boron. First reactions of this new NHC 3 with methyl iodide, elemental selenium, and [Ni(CO)₄] led to the methylated imidazolate ion 4, the dianionic selenium adduct 5, and the dianionic nickel tricarbonyl complex 6. These NHC derivatives provide a first insight into the electronic and steric properties of the dianionic NHC 3. Especially the combination of properties, such as double negative charge, different coordination sites, large buried volume and good σ-donor and π-acceptor ability, make NHC 3 a unique and promising ligand and building block.

中文翻译：

1,3-双(三氰硼烷)咪唑啉-2-亚基阴离子——二位双阴离子N-杂环卡宾配体

_{由咪唑锂和B(CN) 3} -吡啶加合物以高产率获得1,3-双(三氰基硼烷)咪唑根阴离子1。阴离子1的化学性质非常稳定，因此可以分离相应的H ₅ O ₂⁺盐。此外，单阴离子1作为新型双阴离子N-杂环卡宾（NHC）的起始物种，1,3-双（三氰基硼烷）咪唑啉-2-亚基阴离子3通过卡宾中心和硼上的氰基充当二位配体。这种新的 NHC 3与碘甲烷、元素硒和 [Ni(CO) ₄ ]的首次反应生成甲基化咪唑根离子4、双阴离子硒加合物5和双阴离子三羰基镍络合物6。这些 NHC 衍生物让我们首次深入了解双阴离子 NHC 3的电子和空间特性。特别是双负电荷、不同配位位点、大埋藏体积以及良好的σ供体和π受体能力等特性的组合，使NHC 3成为独特且有前途的配体和构建单元。

更新日期：2021-05-07

点击分享查看原文

点击收藏

公开下载

阅读更多本刊新发论文本刊介绍/投稿指南