期刊
JOURNAL OF ORGANIC CHEMISTRY
卷 86, 期 24, 页码 17629-17639出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.joc.1c01741
关键词
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资金
- Ministry of Science and Technology (Taipei)
- Hangzhou Normal University
The Grubbs G-I or G-II catalyst forms a ruthenium ethoxy carbene complex, which catalyzes the ring-opening cross metathesis reaction to produce a diene with an ethoxy substituent. Various hydrocarbons can smoothly undergo this reaction, while tertiary amines, N-alkylimides, esters, and aryl or alkyl bromides remain intact.
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 cyclo- propenes 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 t(50) 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 t(50) 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.
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