Reactions of electron-deficient alkenes with dibromomethylene compounds activated by cyanide and ester groups were promoted by LiI to afford the corresponding cyclopropanes in high yields.
Dichlorination of α-Diazo-β-dicarbonyls Using (Dichloroiodo)benzene
作者:Graham Murphy、Keith Coffey
DOI:10.1055/s-0034-1380304
日期:2015.5
α-Diazo-β-dicarbonyl compounds were chlorinated using (dichloro)iodobenzene and an activating catalyst. A broad range of reaction rates was observed, which paralleled the relative stability/nucleophilicity of the diazo compounds. Acyclic diazocarbonyls reacted faster than cyclics, and β-diketones were much faster to react than β-keto esters or β-diesters. Lewis acid activation was used for the first
Radical Carbofluorination of Unactivated Alkenes with Fluoride Ions
作者:Zhonglin Liu、He Chen、Ying Lv、Xinqiang Tan、Haigen Shen、Hai-Zhu Yu、Chaozhong Li
DOI:10.1021/jacs.8b03077
日期:2018.5.16
The copper-assisted radical carbofluorination of unactivatedalkenes with fluoride ions is described. With [Cu(L3)F2]H2O (L3 = 4,4'-di(methoxycarbonyl)-2,2'-bipyridine) as the fluorine source and [Ag(DMPhen)(MeCN)]BF4 (DMPhen = 2,9-dimethyl-1,10-phenanthroline) as the chloride scavenger, the reaction of unactivatedalkenes with CCl4 in acetonitrile provided the corresponding carbofluorination products
Microwave-assisted atom transfer radical addition of polychlorinated compounds to olefins without addition of metal catalysts
作者:Shin Kamijo、Shoko Matsumura、Masayuki Inoue
DOI:10.1016/j.tetlet.2012.06.027
日期:2012.8
A new operationally simple and robust protocol for the metal-free atom transfer radical reaction (ATRA) has been developed. Polychlorinated compounds were effectively reacted with unactivated terminal olefins to generate 1,3-dichlorinated adducts under microwave irradiation in the presence of silicon carbide (SiC) as a heating element. The present microwave-assisted ATRA proceeds under essentially
Verfahren zur Herstellung von 2,2-Dichlor-malonsäure-diestern
申请人:HÜLS AKTIENGESELLSCHAFT
公开号:EP0687665A1
公开(公告)日:1995-12-20
Es wird ein Verfahren zur Herstellung von 2,2-Dichlor-malonsäure-diestern durch Umsetzung von Malonsäure-diestern mit wäßrigen Alkali-Hypochlorit-Lösungen oder Erdalkali-Hypochlorit-Suspensionen im pH-Bereich ≧ 8 bei niedrigen Reaktionstemperaturen beschrieben. Mit diesem Verfahren werden hohe Ausbeuten und sehr reine Produkte erzielt.