The Chemistry of Aromatic Osmacycles

CORC > 厦门大学 > 化学化工－已发表论文

	The Chemistry of Aromatic Osmacycles
	Cao, Xiao-Yu ; Zhao, Qianyi ; Lin, Zhiqun ; Xia, Haiping ; Cao XY(曹晓宇) ; Xia HP(夏海平)
刊名	http://dx.doi.org/10.1021/ar400087x
	2014-02-18
关键词	ELECTROCHEMICAL PROPERTIES METALLABENZENE CHEMISTRY OSMABENZENES COMPLEX SUBSTITUENTS OSMAFURAN PROGRESS DERIVATIVES ACTIVATION CARBYNE
英文摘要	National Basic Research Program of China (973 Program) [2012CB821600]; National Natural Science Foundation of China; Program for Changjiang Scholars and Innovative Research Team in University (PCSIRT); Minjiang Scholar Program; Aromatic compounds, such as benzene and its derivatives, porphyrins, fullerenes, carbon nanotubes, and graphene, have numerous applications in biomedicine, materials science, energy science, and environmental science. Metalla-aromatics are analogues of conventional organic aromatic molecules in which one of the (hydro)carbon segments is formally replaced by an isolobal transition-metal fragment. Researchers have studied these transition-metal-containing aromatic molecules for the past three decades, particularly the synthesis and reactivity of metallabenzenes. Another focus has been the preparation and characterization of other metalla-aromatics such as metallafurans, metallapyridines, metallabenzynes, and more. Despite significant advances, remaining challenges in this field include the limited number of convenient and versatile synthetic methods to construct stable and fully characterized metalla-aromatics, and the relative shortage of new topologies. To address these challenges, we have developed new methods for preparing metalla-aromatics, especially those possessing new topologies. Our synthetic efforts have led to a large family of dosely related metalla-aromatics known as aromatic osmacycles. This Account summarizes the synthesis and reactivity of these compounds, with a focus on features that are different from those of compounds developed by other groups. These osmacycles can be synthesized from simple precursors under mild conditions. Using these efficient methods, we have synthesized aromatic osmacycles such as osmabenzene, osmabenzyne, isoosmabenzene, osmafuran, and osmanaphthalene. Furthermore, these methods have also created a series of new topologies, such as osmabenzothiazole and osmapyridyne. Our studies of the reactivity of these osma-aromatics revealed unprecedented reaction patterns, and we demonstrated the interconversion of several osmacycles. Like other metalla-aromatics, osma-aromatics have spectroscopic features of aromaticity, such as ring planarity and the characteristic bond lengths between a single and double bond, but the osma-aromatics we have prepared also exhibit good stability towards air, water, and heat. Indeed, some seemingly unstable species proved stable, and their stability made it possible to study their optical, electrochemical, and magnetic properties. The stability of these compouds results from their aromaticity and the phosphonium substituents on the aromatic plane: most of our osma-aromatics carry at least one phosphonium group. The phosphonium group offers stability via both electronic and steric mechanisms. The phosphonium acts as an electron reservoir, allowing the circulation of electron pairs along metallacycles and lowering the electron density of the aromatic rings. Meanwhile, the bulky phosphonium groups surrounding the aromatic metallacycle prevent most reactions that could decompose the skeleton.
语种	英语
出版者	AMER CHEMICAL SOC
内容类型	期刊论文
源URL	[http://dspace.xmu.edu.cn/handle/2288/89384]
专题	化学化工－已发表论文
推荐引用方式 GB/T 7714	Cao, Xiao-Yu,Zhao, Qianyi,Lin, Zhiqun,et al. The Chemistry of Aromatic Osmacycles[J]. http://dx.doi.org/10.1021/ar400087x,2014.
APA	Cao, Xiao-Yu,Zhao, Qianyi,Lin, Zhiqun,Xia, Haiping,曹晓宇,&夏海平.(2014).The Chemistry of Aromatic Osmacycles.http://dx.doi.org/10.1021/ar400087x.
MLA	Cao, Xiao-Yu,et al."The Chemistry of Aromatic Osmacycles".http://dx.doi.org/10.1021/ar400087x (2014).