This work addresses a new approach developed in our laboratory, consisting in the application of isolated dimethyldioxirane (DDO, 1a) labelled with 18O for synthesis of epoxidized glyceryl linoleate (Gly-LLL, 2). We expect that this work could contribute in improving analytical methods for the determination of epoxidized soybean oil (ESBO) in complex food matrices by adopting an 18O-labelled-epoxidized triacylglycerol as an internal standard.

Sono stati analizzati alcuni processi Green per la produzione di materiali plastici da fonti rinnovabili

Our previous studies on the synthesis and reactivity of 1,3-dialkylimidazolium-2-carboxylates and related 1,3-dialkylimidazol-2-ylidenes evidenced an unexpected “double methylation” of the 2-ylidene intermediate with dimethylcarbonate at high temperature affording 1,3-dimethyl-2-ethylimidazolium compounds. 2-alkyl substituted imidazolium compounds have found application as electrolytes for electrochemical devices and as “tasks specific ionic liquids” in the reduction of CO2 to formic acid. Concerning the 2-methyl-substituted imidazolium cation (i.e. 1,2,3-trimethylimidazolium cation), it has been reported that it may undergo proton abstraction by strong bases (as NaH) affording a 1,3-dimethyl-2-methyleneimidazoline, an highly polarized N-heterocyclic olefin (NHO) with a strongly polarized exocyclic C-C bond. We report results about the coordination of the 1,3-dimethyl- 2-methyleneimidazoline ligand to Ni(II) complexes.

By taking advantage of the appreciable stability of dioxiranes in water, a safe yet efficient route to ω-nitro acids by oxidation of lactams of various ring size under mild conditions has been reported. In essentially all the cases examined, reactions proceed selectively to afford products in remarkable high yields (up to 99%) and with high purity (94-99%). Also, an interesting example of higher reaction selectivity in water than in organic solvent (acetonitrile) is discussed.

The reaction of 1,3-dimethylimidazolium-2-carboxylate and dimethylcarbonate (DMC) at high temperature yielded the new compounds 2-ethyl-1,3-dimethylimidazolium methyl carbonate salt and 2-ethyl-1,3-dimethylimidazolium-4-carboxylate zwitterion which were obtained as a mixture in approximately 4:1 molar ratio. The compounds were also isolated in pure form through alternative synthetic procedures and characterized by ESI-HRMS, 1H, 13C NMR and FTIR spectroscopy. The 1,3-dimethylimidazolium-2-carboxylate/dimethylcarbonate system was employed in the synthesis of 1,7-heptanedioic acid dimethyl ester from cyclohexanone and DMC. The target compound was obtained in 49% yield and 66% selectivity.