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Isolation of an Eleven‐Atom Polydentate Carbon‐Chain Chelate Obtained by Cycloaddition of a Cyclic Osmium Carbyne with an Alkyne
Author(s) -
Zhu Congqing,
Zhu Jun,
Zhou Xiaoxi,
Zhu Qin,
Yang Yuhui,
Wen Ting Bin,
Xia Haiping
Publication year - 2018
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201713391
Subject(s) - carbyne , denticity , cycloaddition , alkyne , chemistry , osmium , chelation , ligand (biochemistry) , carbon fibers , polymer chemistry , metal , organic chemistry , carbene , materials science , catalysis , ruthenium , composite number , composite material , biochemistry , receptor
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.