Co2(CO)8 Catalyzed reaction of oxetanes with trialkylsilanes
作者:Kyung-Tae Kang、William P. Weber
DOI:10.1016/s0040-4039(00)98916-0
日期:——
Prevention of Undesirable Isomerization during Olefin Metathesis
作者:Soon Hyeok Hong、Daniel P. Sanders、Choon Woo Lee、Robert H. Grubbs
DOI:10.1021/ja052939w
日期:2005.12.1
1,4-Benzoquinones have been found to prevent olefin isomerization of a number of allylic ethers and long-chain aliphatic alkenes during ruthenium-catalyzed olefin metathesis reactions. Electron-deficient benzoquinones are the most effective additives for the prevention of olefin migration. This mild, inexpensive, and effective method to block olefin isomerization increases the synthetic utility of olefin metathesis via improvement of overall product yield and purity.
作者:Andrew L. Kocen、Maurice Brookhart、Olafs Daugulis
DOI:10.1039/c7cc04953f
日期:——
We report a method for palladium-catalysed chain-running isomerization of terminal and internal alkenes. Using an air-stable 2,9-dimethylphenanthroline-palladium catalyst in combination with NaBAr4 promoter, olefins are converted to the most stable double bond isomer at −30 to 20 °C. Silyl enol ethers are readily formed from silylated allylic alcohols. Fluorinated substituents are compatible with the