Isolation of an Eleven‐Atom Polydentate Carbon‐Chain Chelate Obtained by Cycloaddition of a Cyclic Osmium Carbyne with an Alkyne

Authors: 
Congqing Zhu, Jun Zhu, Xiaoxi Zhou, Qin Zhu, Yuhui Yang, Ting Bin Wen, Haiping Xia*
Journal: 
Angew. Chem. Int. Ed.
Year: 
2018
Volume: 
57
FirstPage-LastPage: 
3154-3157
TOC: 
Abstract: 

Carbon ligands have long played an important role in organometallic chemistry. However, previous examples of all‐carbon chelating ligands are limited. Herein, we present a novel complex with an eleven‐atom carbon chain as a polydentate chelating ligand. This species was formed by the [2+2+2] cycloaddition reaction of two equivalents of an alkyne with an osmapentalyne that contains the smallest carbyne bond angle (127.9°) ever observed. Density functional calculations revealed that electron‐donating groups play a key role in the stabilization of this polydentate carbon‐chain chelate. This process is also the first [2+2+2] cycloaddition reaction of an alkyne with a late‐transition‐metal carbyne complex. This study not only enriches the chemistry of polydentate carbon‐chain chelates, but also deepens our understanding of the chelating ability of carbon ligands.

https://onlinelibrary.wiley.com/doi/abs/10.1002/anie.201713391

Doi: 
10.1002/anie.201713391