Iron-Catalyzed Tunable and Site-Selective Olefin Transposition
作者:Xiaolong Yu、Haonan Zhao、Ping Li、Ming Joo Koh
DOI:10.1021/jacs.0c08631
日期:2020.10.21
earth-abundant iron-based complex, a base and a boryl compound promote efficient and controllable alkene transposition. Mechanistic investigations reveal that these processes likely involve in situ formation of an iron-hydride species which promotes olefin isomerization through sequential olefin insertion/β-hydride elimination. Through this strategy, regiodivergent access to different products from
CC 双键的催化异构化是必不可少的化学转化,用于提供更高价值的类似物,在化学工业中具有重要用途。尽管在该领域取得了进展,但仍然迫切需要一种通用催化解决方案,能够精确控制环状和非环状体系中的 C=C 键迁移位置,以提供二取代和三取代烯烃。在这里,我们展示了催化量的合适的地球丰富的铁基络合物、碱和硼基化合物促进有效和可控的烯烃转位。机理研究表明,这些过程可能涉及原位形成铁氢化物物种,该物种通过顺序烯烃插入/β-氢化物消除促进烯烃异构化。通过这个策略,
Cobalt-Catalyzed Isomerization of 1-Alkenes to (<i>E</i>)-2-Alkenes with Dimethylphenylsilylmethylmagnesium Chloride and Its Application to the Stereoselective Synthesis of (<i>E</i>)-Alkenylsilanes
“Co”axing selectivity into isomerization: Treatment of 1‐alkenes with dimethylphenylsilylmethylmagnesium chloride in the presence of a cobalt‐NHC complex in dioxane at 50 °C or higher provides the corresponding (E)‐2‐alkenes selectively. The isomerization is applicable to the stereoselective synthesis of (E)‐crotylsilanes and (E)‐1‐propenylsilanes from the corresponding homoallylsilanes and allylsilanes
Selective synthesis of (E)-crotylsilanes by reaction of crotylmagnesium bromide with hydrosilanes in the presence of dichloro[1,1′-bis(diphenylphosphino)ferrocene]nickel(II)
作者:Tamio Hayashi、Keiji Kabeta、Makoto Kumada
DOI:10.1016/s0040-4039(01)80196-9
日期:——
Dichloro[1,1′-bis(diphenylphosphino)ferrocene]nickel(II) was found to be an effective catalyst for the reaction of crotylmagnesium bromide with hydrosilanes to give (E)-crotylsilanes selectively.