Catalyst‐free Decarboxylation and Decarboxylative Giese Additions of Alkyl Carboxylates through Photoactivation of Electron Donor‐Acceptor Complex
作者:Chao Zheng、Guang‐Zu Wang、Rui Shang
DOI:10.1002/adsc.201900803
日期:2019.10.8
report herein a catalyst‐free method to perform decarboxylative conjugated addition and hydrodecarboxylation of aliphatic N‐(acyloxy)phthalimides (redox active esters, RAEs) through photoactivation of electron‐donor‐acceptor (EDA) complex with Hantzsch ester (HE) in N,N‐dimethylacetamide (DMA) solution. The reactions present a green method to decarboxylatively construct carbon‐carbon bond and to perform
Rhodium-Catalyzed C,C-Double Bond Cleavage by Molecular Oxygen
作者:Helmut Bönnemann、Washington Nunez、Dieter M. M. Rohe
DOI:10.1002/hlca.19830660119
日期:1983.2.2
Acetylacetonatorhodiumolefin systems, allylrhodium complexes, or (Ph3P)3RhCl catalyzed the conversion of alkenes and molecular oxygen to carbonyl compounds via CC-bond cleavage. For example, 2,3-dimethyl-2-butene was transformed into acetone. Butadiene and isoprene also undergo oxidative CC-bond cleavage to form acrylaldehyde and related compounds.
ketones are generated in moderate yields (50–60%) from allene or a mono-, di- or tri-substitutedallenic hydrocarbon, n alkyl halide and sodium tetracarbonylferrate. The first step is the formation of a complex anion which results from transfer of the alkyl group on a coordinated CO, then of the acyl ligand thus formed on the allenic sp carbon. Protonation with acetic acid yields a hydroxy-η4-trimethylenemethane
Etude spectroscopique quantitative de l'ecart a la planeite du systeme conjugue dans les molecules d'α-enones R1COCR2CH2
作者:A. Bienvenue
DOI:10.1016/0040-4020(72)84043-2
日期:1972.1
UV, NMR and IR spectra of 9 αβ-unsaturated ketones R1COCR2CH2 have been studied, where R1 and R2 are Me, Et, i-Pr, t-Bu or neo-Pe groups. UV and especially IR spectroscopy give more useful information than NMR spectroscopy. When R1 = Me, Et, i-Pr or t-Bu and R2 = Me, an equilibrium exists between the s-trans and a twisted conformation in which the diedral angle between the two π systems is about 120°
1,2,4-Benzenetriol derivatives were efficiently prepared from annulation of α,α-bis(ethylthio)carbonyl compounds with α,β-unsaturated carbonyl compounds.