The construction of metal–carbon bonds is one of the most important issues of organometallic chemistry. However, the chelation of polydentate ligands to a metal via several metal–carbon bonds is rare. Metallapentalyne, which can be viewed as a 7-carbon (7C) chain coordinated to a metal via three metal–carbon bonds, was first reported in 2013.

Caption: A ruthenium–carbon triple bond has been constrained in a five-membered ring to generate ruthenapentalynes. The metallacycle of ruthenapentalyne is highly strained due to the bent Ru≡C–C moiety, considerably deviating from its linear nature.

The reactions of the five-membered cyclic osmacarbyne complex, i.e., osmapentalyne, with a complete set of coinage metal (Cu, Ag, and Au) complexes have been investigated. Osmapentalyne 1 reacts with CuCl or AuCl(PPh3) via its metal–carbon triple bond, leading to the formation of osmapentalyne-copper(I) chloride adduct 2 or osmapentalyne-gold(I)-triphenylphosphine adduct 3, respectively. Moreover, it can react with AgOTf in the presence of 1,10-phenanthroline to give osmapentalyne-silver(I)-phenanthroline adduct 4.

Congratulations to Yunlong Li. He is awarded Zhongxue Scholarship（2018重学奖学金----学院奖学金） Congratulations to Lipeng Long. He is awarded luyan Scholarship.（2017鹭燕奖学金--校级奖学金） Congratulations to Jinhua Li. He is awarded FuWanTong Scholarship of Fujian Rural Credit Union（2018福建农信福万通奖学金--校级奖学金）!

Despite the excellent chemical properties of N-heterocycles, pyrido[1,2-α]azepine remains elusive due to its potential antiaromaticity and lability. Herein, we demonstrate the synthesis and characterization of the first bicyclic pyrido[1,2-α]azepine that leverages the coordination to the ruthenium center to promote the stability of N-bridged bicycle.

Metallaaromatics represent a distinct and attractive class of heterocycles, which have greatly expanded the library of known aromatics. They have garnered extensive research interest on account of their unique properties, organometallic reactivity, and aromaticity.

Carbon ligands have long played an important role in organometallic chemistry. However, previous examples of all‐carbon chelating ligands are limited.

Congratulation to the excellent PhD graduate of our group, Tongdao Wang! He was appointed as Distinguished Research Fellow of Zhang Dayu School of Chemistry, Dalian University of Technology.

Although the formation of metal–carbon σ bonds is a fundamental principle in organometallic chemistry, the direct bonding of one organic molecule with one metal center to generate more than two metal–carbon σ bonds remains a challenge.

Isolation of the simplest 4π three‐membered heterocycles (1H‐azirine, oxirene, thiirene, and selenirene) remains a big challenge due to their π‐antiaromaticity and significant ring strain.