研究室工作进展 Sept 10th, 2009
Isolation, Structural Characterization, and Synthetic Application of Oxy-cyclopentadienyl Dianions
Lantao Liu, Wen-Xiong Zhang, Chao Wang, Congyang Wang, and Zhenfeng Xi*
Angew. Chem. Int. Ed. 2009, 48, in press.
Isolation and applications of OCp: Novel cyclic dianions, lithio oxycyclopentadienyl dianions were isolated in high yields and structurally characterized by X-ray single crystal structural analysis. Interesting reaction chemistry and useful synthetic applications of these cyclic dianions were demonstrated to afford cyclopentadienes or transition-metal complexes.
Cyclic dianions are very important synthetically useful intermediates for construction of organic compounds and organometallic complexes. However, synthetic methods and structural information for cyclic dianions are very much limited.
This paper reports the first isolation and X-ray structural characterization of novel oxy-cyclopentadienyl (OCp for short) dianions generated via a concise reaction of 1,4-dilithio-1,3-butadienes with CO. The concomitance of the CpLi moiety, the exocyclic oxy anion, and those multi-reactive sites makes such dianion species structurally very unique and of novel reaction chemistry.