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Thermolyses of the title compounds at various temperatures have been investigated. At the lower end of the temperature range studied indazoles 5a, b are formed in nearly quantitative yields, while at the upper end formal carbene‐type reaction‐products 6, 7, 8 have been isolated in just as high yields.

Flash vacuum thermolysis of dialkylcarbamoyl azides. -Sumnzary . Thermolysis of several N, N-dialkylcarbanioyl azides 1 in high vacuum gave good yields of 5,5-dialkyl-3-dialkylarnino-2,4-dioxo-5-azonia-imidazolidin-l-id (4) formed by thermal Curtius rearrangements and dimerisation of the resulting N, N-dialkylaminoisocyanates 2.Einleitung. -Im Laufe der vergangenen zehn Jahre ist die photolytische Zersetzung von mono-und disubstituierten Carbamoylaziden eingehend untersucht worden 11-71. Unter diesen Bedingungen gehen die beiden bisher untersuchten Dialkylcarbamoylazide 1 (R = CH3, CzH5) eine Curtius-Reaktion ein und lagerii sich zu den

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