SumilznryThe reaction of cyclo-octanone seinicarbazone(2) with SeO, leads to cyclo-octeno-1,2,3-selenadiazole (3) from which, on heating to 170-220°, cyclo-octyne (5), the lowest stable cycloalkyne, can be prepared in good yields.
Die Photolyse von 1-Acyl-benzotriazolen wird in Abhangigkeit von Solvens, Konzentration und eingestrahlter Wellenlange untersucht. Im photochemischen Primarschritt spaltet sich Stickstoff ab; die Diradikale stabilisieren sich durch Wasserstoff-Abstraktion, Addition von Losungsmittel-Molekulen, RingschluO-Reaktionen unter Wasserstoff-Verschiebung und Polymerisation. Die Konkurrenz dieser Prozesse llBt sich an Hand der Ausbeuten der gebildeten N-Acyl-aniline, 2-Acylamino-biphenyle und des Phenanthridons verfolgen.
Photolysis of I-AcylbenzotriazolesThe photochemical decomposition of I-acylbenzotriazoles is investigated by variation of solvent, concentration and used frequencies. After elimination of nitrogen the diradicals formed are stabilized by abstraction of hydrogen, addition of solvent molecules, ring closure (accompanied with a hydrogen shift) and polymerisation. The competition of these reactions is studied by evaluating the yields of formed N-acylaniline, N-acyl-2-biphenylamine and phenanthridone.
1.2.3-Triazole mit
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