Bonding analysis and the mechanisms on the ring-opening of alkoxy-bridged bis(silylene) transition-metal complexes toward MeOH |
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Authors: | Siwei Bi Yanyun Zhao Xiaojian Kong Qingming Xie |
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Institution: | a College of Chemistry Science, Qufu Normal University, Qufu, Shandong 273165, China b Department of Chemistry, TaiShan University, Tai’an, Shandong 271021,China c Key Laboratory of Colloid and Interface Chemistry, Shandong University, Ministry of Education, Jinan, Shandong 250100, China |
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Abstract: | The mechanistic study on the ring-opening of alkoxy-bridged bis(silylene) transition-metal complexes toward MeOH is performed by using density functional theory. Four steps are predicted to be involved in the reaction, formation of hydrogen bonding between R and a MeOH, ring-opening of the Ru-Si1-O1-Si2 four-membered ring, formation of the six-membered ring, and the hydroxyl hydrogen migration to the metal center. It is found that the reaction is favorable thermodynamically and the hydroxyl hydrogen migration is the rate-determining step. Systematic variations of the structural parameters involved in the reaction mechanism are revealed, which revealed the relationship of the bond strength among Ru-Si, Si-O and O-H bonds. |
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Keywords: | Alkoxy-bridged bis(silylene) complex Ring-opening Reaction mechanism Density functional calculation |
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