Reduced to clear: The reduction of phosphineoxides, sulfoxides, and amine N-oxides is achieved by using bis(2-chlorophenyl)borinic acid /phenylsilane. The reaction tolerates a wide range of substrates and can be performed under mild conditions with only a 2.5 mol % loading of the catalyst. NMR spectroscopy indicates that a borohydride is the key reducing species, and thus, bis(2-chlorophenyl)borinic
Amines<i>vs. N</i>-Oxides as Organocatalysts for Acylation, Sulfonylation and Silylation of Alcohols: 1-Methylimidazole<i>N</i>-Oxide as an Efficient Catalyst for Silylation of Tertiary Alcohols
作者:James I. Murray、Alan C. Spivey
DOI:10.1002/adsc.201500773
日期:2015.12.14
efficiencies of Lewis-basic amines vs. N-oxides for the acylation, sulfonylation and silylation of primary, secondary and tertiary alcohols is reported. Whilst the amines are generally superior to the N-oxides for acylation, the N-oxides are superior for sulfonylation and silylation. In particular, 1-methylimidazole N-oxide (NMI-O) is found to be a highly efficient catalyst for sulfonylation and silylation reactions
PyridineN‐oxide–BF2CF3 and –BF2C2F5 complexes and their derivatives were synthesized. Most of the complexes show fluorescence both in solution and in the solid state. By expanding the π‐conjugated skeleton, the color of the fluorescence could be changed dramatically. A fluorophore with a high solvent dependency could also be produced. Since such compounds can be synthesized on a gram scale in high
A simple and efficient method for the deoxygenation of amine N-oxides to corresponding amines is reported using the green and economical reagent phenylboronic acid. Deoxygenation of N,N-dialkylaniline N-oxides, trialkylamine N-oxides and pyridineN-oxides were achieved in good to excellent yields. The reduction susceptible functional groups such as ketone, amide, ester and nitro groups are well tolerated
Renewable waste rice husk grafted oxo-vanadium catalyst for oxidation of tertiary amines to N-oxides
作者:Vineeta Panwar、Ankushi Bansal、Siddharth S. Ray、Suman L. Jain
DOI:10.1039/c6ra13571d
日期:——
Low cost renewable waste rice husks (RH) have been used as a support for grafting of an oxo-vanadium Schiff base via covalent attachment for the oxidation of tertiary amines to N-oxide. The synthesis of the desired RH grafted oxo-vanadium complex involves prior functionalization of the RH support with amino-propyltrimethoxysilane (APTMS) followed by its reaction with salicylaldehyde to get an RH-functionalized