150466-06-1Relevant academic research and scientific papers
Ring Transformations of Pyrazolinones via Azoolefins - a New Way to the 1,2,3-Thiadiazol-System
Lutze, Gerhard,Kirschke, Klaus,Huebner, Petra,Schmitz, Ernst,Ramm, Matthias,Krauss, Norbert
, p. 169 - 175 (2007/10/02)
Electrophilic attack of thiocyanate/bromine to azoenamine (2a) yields thiocyanato compound 3a which cyclizes into 1,2,3-thiadiazolium-salt (5a) on treatment with perchloric acid. 2-Halo-3-arylazo-propenamides (8) from directly thiadiazolium-salt (11) with
RING TRANSFORMATIONS OF PYRAZOLONES VIA AZO-OLEFINS
Schmitz, Ernst,Lutze, Gerhard,Kirschke, Klaus,Huebner, Petra
, p. 61 - 64 (2007/10/02)
Instead of substitution, 4-halo-pyrazolones undergo ring opening to azo-olefins (2, 12, 16) on reaction with nucleophiles.Attempted Hofmann degradation of N-Haloamides 4 has to compete with either ring closure, involving NHCl-shift to 7, or formation of m
