lithium-chloride and sodium-borohydride

Addition of functionalized aryl, heteroaryl or adamantyl zinc reagents to various nitroso-arenes in the presence of magnesium salts and LiCl in THF produces after a reductive work-up with FeCl2 and NaBH4 in ethanol the corresponding polyfunctional secondary amines in high yields.

Topics: Amines; Borohydrides; Ferrous Compounds; Lithium Chloride; Magnesium; Nitroso Compounds; Zinc

A simple, high yield, chemical process is developed to fabricate layered h-BN nanosheets and BCNO nanoparticles with a diameter of ca. 5 nm at 700 °C. The use of the eutectic LiCl/KCl salt melt medium enhances the kinetics of the reaction between sodium borohydride and urea or guanidine as well as the dispersion of the nanoparticles in water. The carbon content can be tuned from 0 to 50 mol % by adjusting the reactant ratio, thus providing precise control of the light emission of the particles in the range 440-528 nm while reaching a quantum yield of 26%. Because of their green synthesis, low toxicity, small size, and stability against aggregation in water, the as-obtained photoluminescent BCNO nanoparticles show promise for diagnostics and optoelectronics.

Topics: Borohydrides; Boron Compounds; Lithium Chloride; Luminescence; Nanoparticles; Particle Size; Phosphorus; Potassium Chloride; Salts; Solubility; Water

High temperature PCB dechlorination (Aroclor 1016) occurred using NaBH(4) alone in tetraglyme at 290-310 degrees C within 2h in a sealed tube. Aroclor 1016 dechlorination was also quantitatively achieved using NaBH(4)/LiCl/glyme solvents (di-, tri-, or tetraglyme) at 125-135 degrees C. The best results were obtained by prestirring NaBH(4), LiCl and the glyme solvent at room temperature before heating at 125-135 degrees C. At equivalent conditions, PCB dechlorination rates were found to depend on solvent in the order: tetraglyme>triglyme>diglyme. At 130 degrees C, Aroclor 1016 can be dechlorinated in NaBH(4)/LiCl/tetraglyme in 4h. 2-Chlorobiphenyl and 2,2'-dichlorobiphenyl were the least reactive congeners in dechlorinations with NaBH(4)/LiCl in diglyme. Competitive dechlorinations with NaBH(4)/LiCl in diglyme showed 3-chloro- and 4-chlorobiphenyl reacted faster than 2-chlorobiphenyl at 130 degrees C. The reactions were clean with no solvent decomposition in the range of 120-162 degrees C.

Topics: Borohydrides; Environmental Pollutants; Environmental Pollution; Lithium Chloride; Oxidation-Reduction; Polychlorinated Biphenyls; Temperature