Ekkehard Winterfeldt

Additionen an die dreifachbindung—XXII : Das thermodynamisch kontrollierte addukt aus tert.butylisonitril und acetylendicarbonester

Zusammenfassung Preparation, structure elucidation and several chemical transformations of the kinetically controlled adduct of tert.butylisocyanide to acetylendicarboxylate are reported, proving this to be a highly substituted bicyclobutane bearing two keten-immine groups.

Additionen an die dreifachbindung—XVI : Bildung und reaktionen des tetrameren acetylendicarbonsäuremethylesters

Abstract Various transformations of the tetramer of methylacetylene-dicarboxylate 1 are reported. A furanecyclopropene is synthesized and shown to be an intermediate in the tetramerisation process.

Synthese des dl-castoramins

Zusammenfassung Es wird die Synthese des Castoramins, eines aus den Drusen des kanadischen Bibers isolierten Sesquiterpen-Alkaloids, beschrieben. Die Stereoisomeren und die Stellungsisomeren werden ebenfalls dargestellt.

Reaktionen an indolderivaten-XII : Untersuchungen an iminoäthern der indolreihe

Abstract The preparation of iminoethers of the general type 8 is described and their stereochemistry as well as their configurational stability is discussed. Cyclisation attempts under a variety of conditions failed to yield products of the strychnos-type.