Electronically Mismatched Cycloaddition Reactions via First-Row Transition Metal, Iron(III)–Polypyridyl Complex
作者:Jung Ha Shin、Eun Young Seong、Hyeon Jin Mun、Yu Jeong Jang、Eun Joo Kang
DOI:10.1021/acs.orglett.8b02541
日期:2018.9.21
one-electron oxidant, producing radicalcations from olefins and promoting the efficient radicalcation [2 + 2] and [2 + 4] cycloaddition reactions. Subsequent chain propagation afforded trisubstituted cyclobutane or cyclohexene derivatives, and this facile route enables the replacement of rare metals with sustainable, green, and inexpensive iron in radicalcationcycloadditions.
Photooxidizing Chromium Catalysts for Promoting Radical Cation Cycloadditions
作者:Susan M. Stevenson、Matthew P. Shores、Eric M. Ferreira
DOI:10.1002/anie.201501220
日期:2015.5.26
The photooxidizing capabilities of selected CrIII complexes for promotingradicalcationcycloadditions are described. These complexes have sufficiently long‐lived excited states to oxidize electron‐rich alkenes, thereby initiating [4+2] processes. These metal species augment the spectrum of catalysts explored in photoredox systems, as they feature unique properties that can result in differential
Copper- and Nickel-Catalyzed Cross-Coupling Reaction of Monofluoroalkenes with Tertiary, Secondary, and Primary Alkyl and Aryl Grignard Reagents
作者:Hongyan Shi、Wenpeng Dai、Biyun Wang、Song Cao
DOI:10.1021/acs.organomet.7b00859
日期:2018.2.12
with tertiary, secondary, and primary alkyl and aryl Grignardreagents in the presence of a catalytic amount of copper or nickel catalyst, respectively, has been developed. The reactions proceeded smoothly at room temperature, providing (E)-alkene isomers in moderate to high yields. Plausible mechanisms of the Ni-catalyzed coupling reaction of monofluoroalkene with Grignardreagents are suggested.
Reactions en milieu heterogene solide-liquide faiblement hydrate III
作者:Y. Le Bigot、R. Elgharbi、M. Delmas、A. Gaset
DOI:10.1016/s0040-4020(01)87536-0
日期:1986.1
The use of alkaline carbonates in a slighty hydrated solid-liquid protic organic media allowed the synthesis of alkenes from polyfunctionnal aldehydes with high yield in a E preferential stereochemistry specially with non-stabilized ylides. It has been shown that the decomposition of the threo betain acts as the determining step of the reaction.
Stereoselective Rhodium-Catalyzed Isomerization of Stereoisomeric Mixtures of Arylalkenes
作者:Tao Li、Wanxiang Zhao、Hongxuan Yang、Wenke Dong、Wencan Wang
DOI:10.1055/s-0040-1707166
日期:2020.10
Abstract A new efficient method for the synthesis of a high ratio of E-alkenes from E/Z mixtures of alkenes with B2pin2 in the presence of a rhodium catalyst is described. This reaction features mild reaction conditions, broad functional group tolerance, and highly great application potential.