76704-28-4Relevant articles and documents
A further step to sustainable palladium catalyzed oxidation: Allylic oxidation of alkenes in green solvents
dos Santos Costa, Maíra,de Camargo Faria, Amanda,Mota, Rayssa L.V.,Gusevskaya, Elena V.
, (2021/09/14)
The palladium catalyzed oxidation of alkenes with molecular oxygen is a synthetically important reaction which employs palladium catalysts in solution; therefore, a solvent plays a critical role for the process. In this study, we have tested several green solvents as a reaction medium for the allylic oxidation of a series of alkenes. Dimethylcarbonate, methyl isobutyl ketone, and propylene carbonate, solvents with impressive sustainability ranks and very scarcely exploited in palladium catalyzed oxidations, were proved to be excellent alternatives for the solvents conventionally employed in these processes, such as acetic acid. Palladium acetate alone or in the combination with p-benzoquinone efficiently operates as the catalyst for the oxidation of alkenes by dioxygen under 5–10 atm. For most substrates, the systems in green solvents showed better selectivity for allylic oxidation products as compared to pure acetic acid; moreover, the reactions in propylene carbonate solutions occurred even faster than in acetic acid.
Enantiomeric differentiation of oxygenated p-menthane derivatives by 13C NMR using Yb(hfc)3
Lanfranchi, Don Antoine,Blanc, Marie-Cecile,Vellutini, Muriel,Bradesi, Pascale,Casanova, Joseph,Tomi, Felix
experimental part, p. 1188 - 1194 (2009/05/26)
The 13C NMR behaviour of 21 p-menthanic terpene bearing an oxygenated function (alcohol, ketone, acetate) was examined in the presence of a chiral lanthanide shift reagent (Yb(hfc)3). For each monocyclic compound, we measured the lanthanide-induced shift (LIS) on the signals of the carbons and the splitting of signals allowing the enantiomeric differentiation. Some general features were found about their LIS behaviour: experimental data establishing distinct patterns for carvomenthone-like compounds and menthone-like compounds. The enantiomeric splitting was observed for the majority of signals in the spectrum of each compound. In the case of alcohols and acetates, the influence of the relative stereochemistry (cis vs trans) of isopropyl(ene) and the binding function was discussed. Copyright
First enantioselective total synthesis of (-)-13-hydroxyneocembrene
Liu, Zuosheng,Zhang, Tao,Li, Yulin
, p. 275 - 277 (2007/10/03)
The first enantioselective total synthesis of (-)-13-hydroxyneocembrene (1), a naturally occurring cembranoids isolated from soft coral Sarcophyton trocheliophorum, was achieved via a general approach by employing intramolecular McMurry coupling as a key step from (S)-(+)-carvone.
