Hydrogen Bonding as a Construction Element for Bidentate Donor Ligands in Homogeneous Catalysis: Regioselective Hydroformylation of Terminal Alkenes
作者:Bernhard Breit、Wolfgang Seiche
DOI:10.1021/ja0348997
日期:2003.6.1
bidentate ligands for homogeneous metal complex catalysis is described. The concept relies on the self-assembly of monodentate ligands through hydrogen bonding. As a prototype of such systems, 6-diphenylphosphanyl-2-pyridone (6-DPPon) was shown to form a chelate in the coordination sphere of a transition metal center through unusual pyridone/hydroxypyridine hydrogen bonding (X-ray). This hydrogen bonding
Catalytic Asymmetric [4+2]-Cycloaddition of Dienes with Aldehydes
作者:Luping Liu、Hyejin Kim、Youwei Xie、Christophe Farès、Philip S. J. Kaib、Richard Goddard、Benjamin List
DOI:10.1021/jacs.7b08357
日期:2017.10.4
Despite its significant potential, a general catalytic asymmetric [4+2]-cycloaddition of simple and electronically unbiased dienes with any type of aldehyde has long been unknown. Previously developed methodologies invariably require activated, electronically engineered substrates. We now provide a general solution to this problem. We show that highly acidic and confined imidodiphosphorimidates (IDPis)
Synthesis of “Porphyrin-Linker-Thiol” Molecules with Diverse Linkers for Studies of Molecular-Based Information Storage
作者:Daniel T. Gryko、Christian Clausen、Kristian M. Roth、Narasaiah Dontha、David F. Bocian、Werner G. Kuhr、Jonathan S. Lindsey
DOI:10.1021/jo000487u
日期:2000.11.1
efficient synthesis of 1-(S-acetylthio)-4-iodobenzene also has been developed. A set of porphyrins, each bearing one S-acetyl-derivatized linker at one mesoposition and mesityl moieties at the three remaining mesopositions, has been synthesized. Altogether seven new aldehydes, eight free base porphyrins and eight zinc porphyrins have been prepared. The zinc porphyrins bearing the different linkers
Functionalized Nitroalkanes in Organic Synthesis. The first concise preparation of 4-hydroxyheptadecan-7-one and 14-hydroxyoctadecan-8-one, two new hydroxy ketones isolated fromChiococca alba
The 4-hydroxyheptadecan-7-one (1) and 14-hydroxyoctadecan-8-one (2), two new hydroxyketones isolated from leaves of Chiococcaalba, were synthesized, for the first time, by hydroxy-functionalized nitroalkanes 4 and 9, respectively, via two chemoselective key steps: i) nitroaldol condensation with basic alumina, and ii) direct Nef conversion of nitroalkenes to carbonyl derivatives with sodium hypophosphite
The apple leaf midge and raspberry cane midge pheromones have been found to be acetoxyheptadecenone and acetoxyundecanone, respectively, and uses for the related C9-19 oxoalkyl or oxoalkenyl molecules substituted with a lower alkanoyloxy group are provided, including monitoring population levels of the midge and control of midge populations by disrupting mating patterns.