Funktionalisierung von Silicium‐Nanopartikeln mit Fluorwasserstoff und Olefinen

Functionalization of Silicon Nanoparticles with Hydrogen Fluoride and Olefins Silicon nanoparticles (Si‐NPs) from a hot wall reactor (size: 50–300 nm) were freed of surface‐bound SiO_x with anhydrous HF, leaving H‐terminated Si‐NPs. Thermally induced hydrosilylation with 1‐octene lead to the formation of surface bound octyl layers. Using anhydrous HF instead of 40 % hydrofluoric acid leads more efficiently to alkylated Si‐NPs.     

Globale und regionale Klimapolitik

Climate change is a global challenge. So far, global agreements fail to limit the temperature rise to 2°C or 1,5°C. With its products as well as its innovative production processes, the chemical industry makes a decisive contribution to climate protection. Appropriate regional and global policy frameworks are indispensable in order for the chemical industry to fully exploit its innovation potential. EU regional measures should not be an additional burden to the most efficient producers compared to their global competitors.     

Hydrogenation ofmethyl 3a-acetoxy-23-oxo-5b-cholan-24-oatecatalyzed by cinchona alkaloid-modified Pt-alumina catalyst

Summary Methyl-3α-acetoxy-23-oxo-5β-cholan-24-oate is hydrogenated with 78% enantioselection at C23 atom over Pt-alumina catalyst modified with cinchona alkaloids, in liquid phase under mild experimental conditions (293-297 K, hydrogen pressure: 1 bar, concentration of modifiers: 0.1 mmol/L, solvent: THF).     

Nachweis und Bestimmung von Hydrastin und Berberin in Drogen und Extrakten

Ohne Zusammenfassung     

Zur Ermittelung der F?rbekraft des Crocus

Ohne Zusammenfassung