Rapid Microwave-promoted Base-free Suzuki Coupling Reaction of Sodium Tetraphenylborate with Hypervalent Iodonium Salts in Water

The palladium chloride-catalyzed Suzuki coupling reaction of sodium tetraphenylborate with hypervalent iodonium salts was achieved under microwave irradiation in water without base in excellent yield. A convenient and rapid method for formation of carbon-carbon bonds was afforded.

Atom-efficient coupling reaction of aryl bromides with sodium tetraphenylborate catalyzed by reusable Pd/C in water under focused microwave irradiation

A rapid and heterogeneous Pd/C-catalyzed atom-efficient phenylation of aryl bromides by sodium tetraphenylborate takes place under focused microwave irradiation in water. The palladium catalyst can be easily recovered and reused.

Synthesis of Flurbiprofen via Suzuki Reaction Catalyzed by Palladium Charcoal in Water

Flurbiprofen 1, an excellent nonsteroidal antiinflammatory drug, was synthesized in 5 steps in 69% overall yield. The key step of constructing the biaryl fragment was successfully achieved via Pd/C-catalyzed Suzuki coupling reaction in water using sodium tetraphenylborate as phenylation reagent.

Understanding fluorine-free electrolytes via small-angle X-ray scattering

Fluorine-free electrolytes have attracted great attention because of its low-cost and environmental friendliness. However, so far, little is known about the solution structures of these electrolytes. Here,we compare the solvation phenomenon of sodium tetraphenylborate(NaBPh_(4)) salt dissolved in organic solvents of propylene carbonate(PC), 1,2-dimethoxyethane(DME), acetonitrile(ACN) and tetrahydrofuran(THF). Small-angle X-ray scattering(SAXS) reveals a unique two-peak structural feature in this saltconcentrated PC electrolyte, while solutions using other solvents only have one scattering peak.Molecular dynamics(MD) simulations further reveal that there are anion-based clusters in addition to the short-range charge ordering in the concentrated NaBPh4/PC electrolyte. Raman spectroscopy confirms the existence of considerable contact ion pairs(CIPs). This work emphasizes the importance of global and local structural analysis, which will provide valuable clues for understanding the structureperformance relationship of electrolytes.

Isolation and Identification of Potassium Releasing Bacteria from Sugarcane Rhizosphere Soil and Optimization of Fermentation Condition

[Objectives]To isolate and optimize the potassium releasing bacteria from sugarcane rhizosphere soil in Baitu Town,Gaoyao District,Zhaoqing City,Guangdong Province,and then evaluate their potassium-releasing ability,and optimize the fermentation conditions of the strains with the best potassium-releasing ability,so as to provide a scientific basis for the development and production of potassium releasing bacteria fertilizer.[Methods]Potassium-solubilizing bacteria were isolated from sugarcane rhizosphere soil using potassium-feldspar powder as the potassium source of isolation medium by dilution coating method and plate streaking method.The isolated strains were identified by 16s rRNA sequence analysis.The potassium-releasing ability of each strain was determined by sodium tetraphenylborate(STPB)method,and the strain GK-37 with the optimal potassium-releasing ability was selected.The fermentation conditions of GK-37 strain were further optimized,and the effects of different carbon sources on its growth were mainly investigated.[Results]Seven strains of potassium-solubilizing bacteria were isolated and purified,and identified by 16s rRNA.They belonged to Pseudomonas knackmussii,Pseudomonas,Pseudomonas insulaes and Caballeronia zhejiangensis.Among the tested strains,strain GK-37 had the best potassium-releasing ability,and its potassium-releasing capacity was 26.99 mg/L.By optimizing the fermentation conditions of GK-37 strain,it was found that when the fermentation medium was sucrose as carbon source,the growth of the strain was the best.[Conclusions]In this study,the potassium releasing bacteria were successfully isolated and identified from the rhizosphere soil of sugarcane,and the strain GK-37 had high potassium-releasing ability.Through the optimization of fermentation conditions of GK-37 strain,sucrose was determined as the optimal carbon source.This study is expected to provide a valuable reference for the further development and production of potassium releasing bacteria fertilizer.