Now showing items 11-20 of 175
Phenolate radical coupling as a method of triterpene synthesis
The dienone [B] is a possible precursor for the synthesis of tetra- and pentacyclic triterpenes. In this investigation a synthesis of the dimeric phenol [A] and the conversion of [A] to [B] by a phenolate radical coupling ...
The effect of atomic oxygen on the vibrational relaxation of molecular oxygen
The vibrational relaxation of oxygen in the presence of oxygen atoms has been studied in shock waves over the range of 1000° to 3400°K. The experimental section of a shock tube doubled as part of a discharge flow system ...
The color lakes of congo red
Congo Red, the di-sodium salt of diphenyl-disazo-bis-mapthylamine-4-sulfonio acid, forms a free, blue acid when treated with acids and the sodium replaced by hydrogen. This is insoluble but forms a colloidal suspension of ...
Proton resonance detection and identification of intermediates in the pyridoxal catalyzed dehydration of serine and serine-indole synthesis of tryptophan
In an investigation of a proposed mechanism for pyridoxal catalyzed serine dehydration and serine-indole synthesis of tryptophan, pmr spectra of solutions containing 0.05M pyridoxal, serine, tryptophari, and/or indole in ...
Magnetic susceptibility studies in the dual hydrous oxide system NiO–Al_O_
Nickelous oxide, NiO, as normally prepared, consists of crystals larger than the colloidal range of particle size, and exhibits a transformation at about 250°C, detectable by back reflection x-ray diffraction, magnetic ...