Sonoelectroreduction of Metallic Salts: A New Method for the Production of Reactive Metallic Powders for Organometallic Reactions and Its Application in Organozinc Chemistry

The Chemistry of the Polycyclic Polyprenylated Acylphloroglucinols

“…The successful Sonogashira reaction between bromide 235 and propargyl alcohol 236 required the use of diethylamine as the solvent. The so-obtained cross-coupling product 237 underwent partial and stereoselective reduction of its alkyne moiety in the presenec of Zn, AgNO 3 , and Cu(OAc) 2 [78] to afford pyran hemiketal 238 (35 % yield over two steps), which is a valuable intermediate in the synthesis of papuaforin A (1).…”

Die Chemie der polycyclischen polyprenylierten Acylphloroglucine

“…[77] Zur Vorbereitung der Bildung der 2H-Pyran-Einheit wurde das Diol 233 zum entsprechenden Diketon oxidiert und anschließend unter Einfluss von KH und TIPSOTf in den TIPS-Silylenolether 234 umgewandelt. Um die nçtige funktionelle Gruppe für die [78] unterzogen werden, woraufhin das Pyran-Halbketal 238 erhalten wurde (35 % Ausbeute über zwei Schritte), das eine wichtige Zwischenstufe für die Synthese von Papuaforin A (1) ist.…”

Rapid Synthesis of Gold and Platinum Nanoparticles Using Metal Displacement Reduction with Sonomechanical Assistance

“…The ultrasound effect has been explored in sonoelectrochemical and sonochemical syntheses of various metallic nanoparticles including Au, − Ag, Cu, , Zn, and Fe . The sonoelectrochemical reduction, initiated by Reisse et al, is characterized by an electrolysis cell consisting of a power supply, cathode (a titanium horn pulsed sonoelectrode), anode, and electrolyte solution.…”

“…The particle size and particle formation efficiency is dependent on the presence, type, and concentration of the alcohol. In these reactions, electrons from the external power supply and the ultrasound induced free radicals were attributed to be the reducing source in sonoelectrochemical and sonochemical reduction, , respectively, while ultrasound was speculated to be aiding in removing the electrodeposited particles on the sonocathode surface …”