A zwitterionic cyclopentadienyl annulated imidazolium salt
摘要:
The first directly annulated cyclopentadienyl-imidazolium salt has been synthesized and fully characterized. In the solid-state, this zwitterion arranges itself in a hydrogen-bridged head to tail trimer which optimizes ionic interactions. Substantial pi-pi interactions are absent. The UV spectrum of the imidazolium innersalt reflects the intimate electronic interaction arising from direct fusion of cationic and anionic fragments of the molecule. (c) 2005 Elsevier Ltd. All rights reserved.
A zwitterionic cyclopentadienyl annulated imidazolium salt
摘要:
The first directly annulated cyclopentadienyl-imidazolium salt has been synthesized and fully characterized. In the solid-state, this zwitterion arranges itself in a hydrogen-bridged head to tail trimer which optimizes ionic interactions. Substantial pi-pi interactions are absent. The UV spectrum of the imidazolium innersalt reflects the intimate electronic interaction arising from direct fusion of cationic and anionic fragments of the molecule. (c) 2005 Elsevier Ltd. All rights reserved.
A Bimetallic Complex Containing a Cyclopentadienyl-Annulated Imidazol-2-ylidene
作者:Anthony J. Arduengo、Daniela Tapu、William J. Marshall
DOI:10.1021/ja055565f
日期:2005.11.30
A bimetallic carbene complex architecture that incorporates a cyclopentadienyl-annulated imidazol-2-ylidene moiety is characterized. The ligand architecture enables direct electronic interaction between the pi- and sigma-bonded metals. A preliminary example of aqueous Suzuki coupling employing a metallocene-fused imidazol-2-ylidene-derived catalyst is described.
表征了包含环戊二烯基环化咪唑-2-亚基部分的双金属卡宾复合结构。配体结构使 pi 和 sigma 键合金属之间的直接电子相互作用成为可能。描述了使用茂金属稠合的咪唑-2-亚基衍生催化剂的水性 Suzuki 偶联的初步实例。