Fast genügend große irreduzible 3-dimensionale Mannigfaltigkeiten

Ohne Zusammenfassung     

Holomorphe Blätterungen komplexer Räume

Ohne Zusammenfassung Herrn Professor Dr. Karl Stein zum 60. Geburtstag gewidmet Die Ergebnisse der vorliegenden Arbeit wurden auf den 6. Rolf Nevanlinna-Kolloquium in Zürich (18./19. Juni 1971) vorgetragen.     

Professor KURT ISSLEIB zum 60. Geburtstage am 19. November 1979

Phosphorus-Carbon-Halogen Compounds. 16. On the Reaction of Alkyldiphenylphosphanes with Tetrachloromethane and a Convenient Preparation of (α-Chloroalkyl)diorganylphosphanes The reaction of alkyldiphenylphosphanes with carbon tetrachloride in aprotic solvents gives (dichloromethyl)alkyldiphenylphosphonium chloride and (α-chloroalkyl)diphenylphosphanes. Their formation is attributed to the dehydrochlorination of the intermediate dichloroalkyl diphenylphosphoranes by the ylid (dichloromethylene)alkyldiphenylphosphorane, also formed intermediately. In protic solvents the ylids abstract protons while the dichlorophosphoranes remain unchanged. Dehydrochlorination of alkylsubstituted dichlorophosphoranes by means of tertiary amines turned out to be a convenient synthesis of (α-chloroalkyl)diphenylphosphanes.     

Thermodynamic properties of liquid zinc-bismuth alloys

Thermodynamic properties of liquid Zn–Bi alloys were investigated between 5 and 95 at % Zn from the liquidus curve to 750°C using anemf method with a molten salt electrolyte. Partial and integral values were calculated and compared with results from the literature. From theemf data the liquidus curve was calculated. The thermodynamic data of the Zn–Bi system are well established and consistent with the phase diagram. The entropies of mixing of various group IIB-VA systems are compared and discussed with respect to compound formation in the liquid state.With 5 Figures