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[Science Advances] Prof. Haiping Xia published a paper entitled "Constraint of a ruthenium-carbon triple bond to a five-membered ring"

2018-06-29

Title: Constraint of a ruthenium-carbon triple bond to a five-membered ring

Authors: Qingde Zhuo*, Hong Zhang*, Yuhui Hua, Huijun Kang, Xiaoxi Zhou, Xinlei Lin, Zhixin Chen, Jianfeng Lin, Kaiyue Zhuo and Haiping Xia†

Abstract:

The incorporation of a metal-carbon triple bond into a ring system is challenging because of the linear nature of triple bonds. To date, the synthesis of these complexes has been limited to those containing third-row transition metal centers, namely, osmium and rhenium. We report the synthesis and full characterization of the first cyclic metal carbyne complex with a second-row transition metal center, ruthenapentalyne. It shows a bond angle of 130.2(3)° around the sp-hybridized carbyne carbon, which represents the recorded smallest angle of second-row transition metal carbyne complexes, as it deviates nearly 50° from the original angle (180°). Density functional theory calculations suggest that the inherent aromatic nature of these metallacycles with bent Ru≡C–C moieties enhances their stability. Reactivity studies showed striking observations, such as ambiphilic reactivity, a metal-carbon triple bond shift, and a [2 + 2] cycloaddition reaction with alkyne and cascade cyclization reactions with ambident nucleophiles.