Heterocyclic synthesis with β-ketosulfoxides IV. Synthesis of 3-substituted chromones

A novel synthesis of 3-(hydroxymethyl)chromones from o-hydroxy-ω-(methylsulfinyl)acetophenones has been developed. These have been utilized in the synthesis of 3-formyl, 3-cyano, 3-carboxy, 3-carboxamido, 3-chloromethyl, 3-aminomethyl and 3-methoxymethylchromones.     

Über nichtlineare Schwingungen mit unstetiger Erregung

Ohne Zusammenfassung     

Using the chern-simons action for a self-consistent determination of the magnetic screening mass in thermal QCD

We present a self-consistent determination of the screening mass for chromomagnetic fields in QCD within the framework of dimensional reduction. The three-dimensional Chern-Simons density is used as a mass term for a self-consistent perturbative calculation that yields a value of m approximately 1.604(g(2)N/2pi)T for the magnetic screening mass.     

Electrogenerated chemiluminescence in mechanistic investigation of electroorganic reactions: Part IV. Luminescence oscillations at the falling mercury drop

In the intensity-potential curves of the electrogenerated chemiluminescence at the dropping mercury electrode spikes are observed, which are due to the reaction of excessive anion radicals A^?. at the falling mercury drop. The luminescence trace of the drop exhibits a characteristic intensity pattern. These oscillations arise from an interplay of a concentration difference of A^?. between the front and back sides or the falling drop, which is hydrodynamically caused and leads to a corresponding difference in the electrochemical potential and in the surface tension, and a surface movement of the mercury as the retroactive effect. The influence of the experimental conditions and the structural effect of the investigated cathodic luminescence systems on the oscillating behavior are studied.