303ChemInform Abstract The oxazol-5-one (IV) is obtained from glycine (I) and hexafluoroacetone (II) by subsequent treatment of (III) with SO2Cl2 or AIBN. (IV) reacts with the ynamines (V) to form the cycloaddition products (VI). Hydrolysis with diluted HCl produces a mixture of the isomers (VII) and (VIII) which are separated and treated with conc. HCl to give the aspartic acid derivatives (IX). (IR-, 1H-, 19F-NMR-data).

Piaselenolium ‐ Pentaiodid (C6H4N2Se‐ C6H5N;Se+ I3′ J2), eine Struktur mit Polyiodidschichten.

Die beiden Verbindungen (I) und (IV) bilden mit Tetrathiafulvalen (II) Donator‐Akzeptor‐Komplexe, wobei die Schwefeldiimidchinone die Rolle des Akzeptors übernehmen.

ChemInform Abstract The substitution reactions of the title complexes (I) with CO and 2-xylyl isocyanide (II), NaN3 (III), or tert. butyl cyanide (VI) giving the derivatives (III), (IV), and (VII), respectively, are described and rationalized with reference to an X-ray structure analysis of the starting Os complex (Ia) (space group P21/n Z=4). This complex reveals a comparatively short Os-S bond and a long Os-Cl bond (no yields given).

Die Umsetzung der Diazadiene (Ia) und (Ib) mit Cyanameisensäureethylester (II) führt zu den beiden Heterocyclen (IIIa), (IIIb), (IVa) und (IVb).