(III) from (I) and of 21-norpregnan-20-als (IV) from (II) (Brooks & Norymberski, 1953). The last conversion was presumed; it is now established by the isolation of 3,-hydroxy-21-norpregn-5-en-20-al (VI) (as its acetate) from the reaction of pregn-5ene-3f:20fl:21-triol (V) with sodium bismuthate. Reduction with borohydride followed by oxidation with sodium bismuthate was expected to convert 20:2...

Polyaniline and polyamide (nylon 6,6) nanocomposites with Silva were prepared by in-situ oxidativepolymerization of aniline monomers in the presence of Ag salt Nano particles of silver (NPs) were symthesieedby controlled reduction of Ag+ ions kith sodium borohydride at room temperature. Nylon 6,6 wax loaded withAg nanoparfieles by erdrapment of Ag+ ions into the polymer network, followed by red...

Hexavalent chromium wastes need to be chemically reduced to trivalent chrome in the shop’s treatment plant. This necessitates the use of expensive chemicals such as sulfur dioxide, sodium metabisulfite or sodium borohydride. Also considerable hazardous sludge is generated during the neutralization step of the treatment process due to the high chromium concentration of the plating solutions. Haz...

Reduction of reconstituted native type collagen fibrils with sodium borohydride produced a firmly cross-linked polymer as determined by solubility, thermal shrinkage and dissolution, and renaturation studies, and by examination of the denatured protein by ultracentrifugation, gel filtration, polyacrylamide electrophoresis, and carboxymethyl cellulose chromatography. Maximum reduction occurred w...

Objective: To develop silver nanoparticles stabilized in the hydroalcoholic extract of Mentha Piperita L. for adjuvant treatment depression. Methodology: In synthesis a solution, 25 mL nitrate (1.0 mmol/L) and 75 sodium borohydride (2.0 were used. These two substances mixed at room temperature under magnetic stirring. Another solution used 100 until boiling was reached 5 citrate (1%) added The ...

To investigate the optical properties of chemithermomechanical pulp (CTMP) from Eucalyptus camaldulensis, one group of samples of CTMP was aged by heating, and another group was first subjected to bleaching with different bleaching agents, and then aging by exposure to sunlight. Chromophores were analyzed using diffuse reflectance UV-Vis spectra (DRUV), and the brightness and color parameters (...