Über denp-Rang der Klassengruppe des Kompositums algebraischer Zahlkörper

Ohne ZusammenfassungDiese Arbeit entstand im Rahmen eines durch das Land Nordrhein-Westfalen geförderten Forschungsvorhabens.     

Elektronenreiche übergangsmetallkomplexe : V. Phosphinsubstituierte wolframdicarbonyle

Chloride-bridged tungsten tricarbonylmetalates [(OC)₃W(Cl)₃W(CO)₃]^3?, obtainable in high yields from tungsten hexacarbonyl and tetraalkylammonium chlorides, with allyl halides give π-allylhalogenotungsten dicarbonyls. With phosphines reductive elimination of allylhalide yields bis- or tris-(phosphine)-tungsten-dicarbonyls L₂W(PR₃)₂(CO)₂, LW(PR₃)P₃(CO)₂ (L = CH₃CN). Substitution reactions of L with various ligands under mild conditions are described. IR and electronic spectra of more than twenty new compouonds are discussed and compared with corresponding compounds of molybdenum.     

Synthesis of 3-aryl-4-isothiazolecarboxylates

A short, convenient route to 3-aryl-4-isothiazolecarboxylates is described in which aryl Grig-nard reagents are added to the magnesium etiolate of ethyl cyanoacetete, and the resultant β-aminocinnamates are converted via a Vilsmeier-Haack reaction, thiation, and oxidation to the isothiazolecarboxylates.     

Rühreffekte bei der Vernetzungspolymerisation-Popcornpolymer-und Gelbildung

Stirring vinyl acetate—(1 Mol%) divinyl adipate mixtures during polymerization influences the gel formation. Popcornpolymer polymerization influences the gel formation. Popcorn-polymer formation is highly favored. To the contrary the growth of popcorn polymer particles in the stirred system is slowed down. An explanation of this behavior is offered.

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