A Two‐Coordinate Cobalt(II) Imido Complex with NHC Ligation: Synthesis, Structure, and Reactivity. Issue 43 (31st August 2015)

• Record Type: Journal Article
• Authors: Du, Jingzhen; Wang, Linbo; Xie, Meihua; Deng, Liang
• Is Part Of: Angewandte Chemie international edition. Volume 54:Issue 43(2015)
• Page Start: 12640
• Page End: 12644
• Publication Date: 2015-08-31
• Subjects: Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.201505937
• Languages: English
• ISSNs: 1433-7851

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>The synthesis, structural characterization, and reactivity of the first two‐coordinate cobalt complex featuring a metal–element multiple bond [(IPr)Co(NDmp)] (<bold>4</bold>; IPr=1, 3‐bis(2′, 6′‐diisopropylphenyl)imidazole‐2‐ylidene; Dmp=2, 6‐dimesitylphenyl) is reported. Complex <bold>4</bold> was prepared from the reaction of [(IPr)Co(η²‐vtms)₂] (vtms=vinyltrimethylsilane) with DmpN₃. An X‐ray diffraction study revealed its linear CCoN core and a short CoN distance (1.691(6) Å). Spectroscopic characterization and calculation studies indicated the high‐spin nature of <bold>4</bold> and the multiple‐bond character of the CoN bond. Complex <bold>4</bold> effected group‐transfer reactions to CO and ethylene to form isocyanide and imine, respectively. It also facilitated EH (E=C, Si) σ‐bond activation of terminal alkyne and hydrosilanes to produce the corresponding cobalt(II) alkynyl and cobalt(II) hydride complexes as 1, 2‐addition products.</p> </abstract>