研究室工作进展 Feb. 28th, 2019

发表于 2019-02-28

Selective Reduction of 1,5-Diazacyclooctatetraenes:

Synthesis and Structures of Aromatic Diazacyclooctatetraenyl Dianions

and 2,6-Bipyrrolinyl Dianionic Co(II) Complex

Zhe Huang, Gengwen Tan（南京大学）, Chao Chen（南京大学）, Wen-Xiong Zhang,

Xinping Wang（南京大学）and Zhenfeng Xi*

Chem. Commun. 2019, 55, 2648-2651.

1,5-Diazacyclooctatetraene (NCOT) is an interesting diaza-analogue of the well-known cyclooctatetraene (COT) with its two 1,5-CHs being replaced by two N atoms, but the reactivity of NCOT remains almost entirely unknown. The incorporation of nitrogen atoms into the conjugated system would bring about new chemistry.

In this work, as shown in the scheme, the first structurally well-defined aromatic 1,5-diazacyclooctatetraenyl dianion, an analogue of the well-known cyclooctatetraenyl dianion, was realized via a two-electron reduction of NCOT with potassium. A novel dinuclear Co(II) complex bridged by a bipyrrolinyl dianion was formed by the reduction of NCOT with a Co(I) complex and was successfully structurally characterized.

This work is a joint project with 南京大学化学学院王新平教授课题组 supported by NSFC 重大项目“面向精准合成的新金属配合物及其反应研究”.