[EN] (6R,10R)-6,10,14-TRIMETYLPENTADECAN-2-ONE PREPARED FROM 6,10-DIMETYLUNDECA-3,5,9-TRIEN-2-ONE [FR] (6R,10R)-6,10,14-TRIMÉTHYLPENTADÉCAN-2-ONE PRÉPARÉE À PARTIR DE 6,10-DIMÉTHYLUNDÉCA-3,5,9-TRIÈNE-2-ONE
Electrogenerated Acid-catalyzed Cyclization of Isoprenoids
作者:Kenji Uneyama、Akihiro Isimura、Sigeru Torii
DOI:10.1246/bcsj.58.1859
日期:1985.6
Biogenetic-type cyclization of some isoprenoids (geranyl phenyl sulfone, methyl geranate, pseudoionone, and 6,10-dimethyl-2,5,9-undecatrien-4-one) has been performed by use of an electrogenerated acid in 1,2-dichloroethane.
Synthès biomimétique des sesqui-ionones α-cis, α-trans et β
作者:Didier Babin、Marc Julia
DOI:10.1016/s0040-4020(01)91803-4
日期:1984.1
dimethylvinylcarbinol and formic acid. The distal doublebond in the formyl-oxy-ketone was protected by conversion into the corresponding methoxy bromide with NBS/MeOH. Sulfuric acid effected the cyclisation with the ringdoublebond in the β position; reductive removal of the protecting group followed by reoxidation led to “sesqui-β-ionone” 10. Phosphoric acid led to the α isomers (cis and trans) of the bromoethers
Beta-ionone synthesis using anhydrous hydrogen fluoride
作者:Yu. D. Markovich、A. V. Panfilov、A. A. Zhirov、A. T. Kirsanov、L. A. Gorbach、K. A. Taraskin
DOI:10.1007/bf02465747
日期:1998.10
this investigation was to search for a new cyclization agent, which can be regenerated after use in the reaction. As is known, anhydroushydrogenfluoride is capable of regenerating carbocations from unsaturated compounds [4]. The rather low boiling temperature of hydrogenfluoride (19.5~ allows it to be readily removed from the mixture upon reaction. In this connection, it was expedient to study the cyclization
Site‐Selective Hydrogenation of Electron‐Poor Alkenes and Dienes Enabled by a Rhodium‐Catalyzed Hydride Addition/Protonolysis Mechanism**
作者:Duanyang Kong、Qiqige Qiqige、Wesley McNutt、Rocco Paciello、Ansgar Schäfer、Mathias Schelwies、Rylan J. Lundgren
DOI:10.1002/anie.202210601
日期:2022.10.10
Rh(CO)2acac/xantphos in methanol catalyzes the selective mono-hydrogenation of electron-poor dienes and related substrates at low metal loadings via a hydride addition/Rh-enolate protonation pathway.