نتایج جستجو برای: sodium borohydride reduction
تعداد نتایج: 665270 فیلتر نتایج به سال:
This unit describes the fractionation and analysis of neutral oligosaccharides by high-performance liquid chromatography (HPLC) on bonded amine columns. Separation is based upon hydrogen bonding between the NH2 groups of the column and the hydroxyl groups of the oligosaccharides. A support protocol describes the reduction and desalting of neutral oligosaccharides with sodium borohydride.
Studies directed at the amine exchange reaction of vinamidinium salts followed by sodium borohydride reduction to secondary and tertiary allylic amines are described. The tertiary allylic amines were alkylated and subjected to base mediated rearrangement to yield a variety of highly functionalized tertiary homoallylic amines.
A facile, low-temperature reduction method using sodium borohydride to yield corundum-type Ti(2)O(3) nanorods from rutile-type TiO(2) nanorods with morphology retention is proposed. The electrochemical analyses confirmed their promising performance as electrodes and excellent stability to the environment of interest for fuel cell operation.
1. The pneumococcal type IX polysaccharide (polysaccharide S IX) has been oxidized by sodium metaperiodate and reduced by sodium borohydride. Of the constituent monosaccharides, N-acetylglucosamine and N-acetylmannosamine remain unaltered, whereas 40% of the glucose and 90% of the glucuronic acid are oxidized. 2. The effect of oxidation and subsequent reduction on the precipitation of polysacch...
The specificity of a GC/MS assay of morphine and codeine was examined with particular regard to the potential interference due to hydromorphone and hydrocodone, compounds that cross-react extensively in opiate screening tests. A GC/MS method with solid-phase extraction and acetylation or trimethylsilylation was used. The equilibrium between keto and enol forms of the potential interferents was ...
Titanium dioxide is a very attractive material in catalysis. Although the titanium exhibits superior proper-ties ultra violet radiation, activity of catalyst can be improved by some modifications specially for daylight radiation. was colored thermal decomposition sodium borohydride at 400 0C. The gray nanotube-titanium obtained where molar ratio to borohydride, 1.2 and 0.6. black prepared makin...
A variety of phosphine oxides and sulfides can be efficiently converted directly to the corresponding phosphine boranes using oxalyl chloride followed by sodium borohydride. Optically active P-stereogenic phosphine oxides can be converted stereospecifically to phosphine boranes with inversion of configuration by treatment with Meerwein's salt followed by sodium borohydride.
the difficult to handle and store zinc borohydride, zn(bh4)2, is stabilized by supporting it on polyvinylpyridine. this new mild, efficient, selective, and regenerable polymer supported borohydride reducing agent reduces a variety organic compounds such as, aldehydes, a-b-unsaturated carbonyl compounds, acid chlorides, epoxides, disulfides, as well as reductive acetylation of carbonyl compounds...
نمودار تعداد نتایج جستجو در هر سال
با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید