Bestimmung von Perchlorethylen (PCE) in Tierk?rpermehlen mittels HPLC

Ohne Zusammenfassung

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Determination of perchlorethylene in carcasse meal by means of HPLC

     

Komplexkatalyse : XII. Nitrido-molybdän(VI)-Komplexe; ein neuer Typ von Hochaktiven Präkatalysatoren für die Olefinmetathese

The preparation of the trichloronitridomolybdenum (VI) complexes MoNCl₃(OPPh₃)₂, MoNCl₃(Dipy), and [Bu₄N] [MoNCl₄] and their suitability as precatalysts for the metathesis of 2-pentene is described.     

Ein neuer zugang zu indeno[1,2-b]pyridinen

A new synthesis of 5H-indeno[1,2-6]pyridines [IV] starting from 4-cyanobutyrophenones [I] or their cyclization products, the 6-phenyl-3,4-dihydropyridin-2-ones [II], is reported. The condensation of I or II in polyphosphoric acid with aromatic or heteroaromatic aldehydes [III] yields 1,2,3,4-tetrahydro-5H-indeno[1,2-b]pyridin-2-ones [IV]. 2,3,4,4a,5,9b-Hexahydro-1H-indeno[1,2-b]pyridines [X, XI] which were previously difficult to obtain can now be easily synthesized from compounds IV.     

Selective coupling of free radicals via organochromium complexes.

Free radicals can be coupled in high yield to give either symmetric dimers or cross coupling products by reacting chromous chloride in THF with alkyl halides.     

Das Pyrrocorphin-Ligandsystem: Synthese des 2,2,7,7,12,12,17-Heptamethyl-2,3,7,8,12,13-hexahydroporphyrins. Kurzmitteilung

The Pyrrocorphin Ligand System: Synthesis of 2,2,7,7,12,12,17-Heptamethyl-2,3,7,8,12,13-hexahydroporphyrin Reaction Schemes 4 and 6 summarize the synthesis of the title compound, a representative of a recently described novel type of hexahydroporphinoid ligand system (‘pyrrocorphin’). Pyrrocorphins incorporate structural elements of both corrins and porphyrins and are chemically closely related to the tautomeric non-pyrrolic corphins (Scheme 1). The synthesis exemplifies a methodology for constructing pyrrolic hydro-porphinoids with the methods of corrin instead of porphyrin synthesis. An X-ray analysis of 2-(cyanomethyl)-2-methyl-3-oxobutanamide has been carried out.     

Gated sets in metric spaces

The concept of a gated subset in a metric space is studied, and it is shown that properties of disjoint pairs of gated subsets can be used to investigate projections in Tits buildings.Dedicated to Professor Otto Haupt with best wishes on his 100th birthday