https://scholars.lib.ntu.edu.tw/handle/123456789/600439
標題: | A Fischer-Type Ruthenium Carbene Complex as a Metathesis Catalyst for the Synthesis of Enol Ethers | 作者: | Wang, Xia-Lin Chiang, Nicholas Yiching Peng, Jian-Jhih Yu, Lei Xu, Li-Jun Yang, Hau-Ren BIH-YAW JIN Zhang, Pinglu YU-YING LAI Li, Ze Lai, Guo-Qiao TIEN-YAU LUH |
關鍵字: | Amines;Catalysts;Ethers;Olefins;Ruthenium compounds;Carbene complexes;Catalyse;Cross metathesis;Cyclic alkenes;Enol ethers;Metathesis catalysts;Nucleophilicities;Ring opening;Ruthenium carbene complexes;]+ catalyst;Esters | 公開日期: | 2021 | 卷: | 86 | 期: | 24 | 起(迄)頁: | 17629-17639 | 來源出版物: | Journal of Organic Chemistry | 摘要: | The Grubbs G-I or G-II catalyst gives the ruthenium ethoxy carbene complex, which catalyzes ring-opening cross metathesis (ROCM) of a strained cyclic alkene to give a diene where one of the two alkene moieties in the product contains an ethoxy substituent. No polymeric products are detected. Hydrocarbons such as parent norbornene or substituted cyclopropenes can proceed with the reaction smoothly. Tertiary amines, N-alkylimides, esters, and aryl or alkyl bromides remain intact under the reaction conditions. In addition to vinyl ethers, vinylic esters can also be used. The time required to reach a 50% yield of the ROCM product t50 varies from 0.01 to 140 h depending on the strain and nucleophilicity of the double bond. Anchimeric participation of an electron-rich group would result in significant enhancement of the reactivity, and the t50 could be as short as several minutes. A similar substrate without such a neighboring group shows a much slower rate. An exo-norborne derivative reacts much faster than the corresponding endo-isomer. Alkenes with poor nucleophilicity are less favored for the ROCM process, so is less strained cyclooctene. ? 2021 American Chemical Society |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85120727729&doi=10.1021%2facs.joc.1c01741&partnerID=40&md5=6500919c55d9fe1fd348b0e8c63149a3 https://scholars.lib.ntu.edu.tw/handle/123456789/600439 |
ISSN: | 00223263 | DOI: | 10.1021/acs.joc.1c01741 |
顯示於: | 高分子科學與工程學研究所 |
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