A low-cost environmentally friendly approach to isolate lignin containing micro and nanofibrillated cellulose from Eucalyptus globulus bark by steam explosion

Cellulose - Micro- and Nano-Fibrillated Cellulose (MNFC) have gained increasing attention due to their remarkable properties, but their production usually requires an intensive multi-step process....     

Systemes aromatiques a 10 electrons π derives de l'aza-3a pentalene—XVIII : Recherches dans la serie du s-triazolo[4,3-b]s-triazole

From electric dipole moment measurements, it has been possible to determine the tautomerism of the s-triazolo[4,3-b]s-triazole and the structure of its N-methyl derivatives. The structure of the predominant tautomer N(H) 1 is in agreement with theory and with the UV and NMR spectroscopic data.     

Etude du mecanisme de la cyclotrimerisation catalytique de l'hexyne-3 par l'intermediaire d'un complexe cyclobutadienique du nickel

The reduction of nickel halide by metals in low oxidation states, in a boiling solution of 3-hexyne in tetrahydrofuran leads to catalytic and quantitative cyclotrimerisation of the unsaturated compound. During the reaction, tetraethylcyclobutadienenickel(II) dibromide can be isolated in appreciable yield. A mechanism is proposed for the cyclotrimerisation.