1. Isolation of an Eleven‐Atom Polydentate Carbon‐Chain Chelate Obtained by Cycloaddition of a Cyclic Osmium Carbyne with an Alkyne.
- Author
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Zhu, Congqing, Zhu, Jun, Zhou, Xiaoxi, Zhu, Qin, Yang, Yuhui, Wen, Ting Bin, and Xia, Haiping
- Subjects
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ORGANOMETALLIC chemistry , *CHELATES , *RING formation (Chemistry) , *METAL carbyne complexes , *ALKYNES - Abstract
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. [ABSTRACT FROM AUTHOR]
- Published
- 2018
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