1. 4-Amino-5-acetylenylpyrazoles are capable of isomerizing in the presence of Cu(I) salts, with closure of the pyrrole ring and formation of the condensed pyrrolo[3,2-c]pyrazole system. 2. The 5-amino-4-acetylenylpyrazoles, in contrast to the 4-amino-5-acetylenyl derivatives, and also the o-acetylenylanilines, do not cyclize under analogous conditions.
|Number of pages||3|
|Journal||Bulletin of the Academy of Sciences of the USSR Division of Chemical Science|
|Publication status||Published - 1 Mar 1983|
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