133560-75-5Relevant articles and documents
SYNTHESIS, ELECTRONIC STRUCTURE, AND PHYSICOCHEMICAL CHARACTERISTICS OF PYRAZOLOPYRIDAZINIUM
Voshula, V. N.,Vysotskii, Yu. B.,Seraya, V. I.,Novikova, N. T.,Mushii, R. Ya.,Dulenko, V. I.
, p. 1349 - 1357 (2007/10/02)
The interaction of 1-methallylpyrazoles with acetic or propionic anhydride in the presence of perchloric acid forms products of acylation at the double bond and subsequent heterocyclization - pyrazolopyridazinium salts - that are representatives of a new heteroaromatic system.Analogous cyclization is observed in the acylation of 3-(2-hydroxy-2-methylpropyl)pyrazole.