Photochemical oxidation of benzylic primary and secondary alcohols utilizing air as the oxidant
作者:Nikolaos F. Nikitas、Dimitrios Ioannis Tzaras、Ierasia Triandafillidi、Christoforos G. Kokotos
DOI:10.1039/c9gc03000j
日期:——
green photochemical protocol for the oxidation of alcohols to aldehydes and ketones was developed. Utilizing thioxanthenone as the photocatalyst, molecular oxygen from air as the oxidant and cheap household lamps or sunlight as the light source, a variety of primary and secondary alcohols were converted into the corresponding aldehydes or ketones in low to excellent yields. The reaction mechanism was extensively
Rhodium-Catalysed Tandem Hydroformylation/Arylation Reaction with Boronic Acids
作者:Ana R. Almeida、Roberto D. Dias、Carlos J. P. Monteiro、Artur R. Abreu、Pedro M. P. Gois、J. Carles Bayon、Mariette M. Pereira
DOI:10.1002/adsc.201300968
日期:2014.4.14
A new efficient multicatalytic process involving a single catalyst to promote tandem hydroformylation/arylation reactions is disclosed. The effect of the rhodium ligand was evaluated and the rhodium/triphenylphosphine catalytic system was selected to apply the methodology to different olefins and boronic acids. High yields (up to 89%) and good to excellent isomer ratios (up to 98:2) were achieved using
Polydora websterii, a harmful lugworm that has serious adverse effects on pearl oyster cultivation, was inhibited by a marine diterpene, crenulacetal C, isolated from the brown alga Dictyota dichotoma, Based on consideration of the activity-structure relationship, several synthetic compounds having an aromatic moiety with a hydroxyalkyl chain were prepared. Bioassay using larvae of Polydora websterii as well as pearl oysters (Pinctada fucata martensii) suggested that 1-(2-furyl)-1-nonanol was the most promising inhibitor.
Lack of the neighboring group rate effect in solvolytic reactions that proceed via participation
作者:Sandra Jurić、Olga Kronja
DOI:10.1002/poc.1290
日期:2008.2
In order to investigate the influence of solvent polarity on the rate effect of double bonds in reactions that proceed via an extended π-participation mechanism, the solvolysis rates (kU) of the benzyl chloride derivative 1 and tertiary chloride 2 that have doubly unsaturated side chains were measured in absolute ethanol, 80% v/v. aq. ethanol and 97% wt. aq. trifluoroethanol. The rates of the corresponding
discovery of Warfarin in the 1940s, the design of new warfarin-derived anticoagulants for rodent management has been challenging, with mainly structural modifications performed on the C3 position of the coumarin skeleton. In order to better understand the pharmacomodulation of such derivatives, we have synthesized a family of C3 (linear and branched) alkyl-4-hydroxycoumarins, which led to the identification